A particle is moving along the positive x -axis as x = a t - 3 + b t - 3 2 + 4 t - 3 , which of the following is true?

The acceleration of the particle is 2 b

The initial velocity of the particle is a - 2 b + 4

The particle is at origin at t = 4

The acceleration of particle is 6 b

A bomb is dropped by a fighter plane flying horizontally. To an observer sitting in the plane, the trajectory of the bomb is a :

straight line vertically down the plane

parabola in a direction opposite to the motion of plane

parabola in the direction of motion of plane

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A shell is fired from a fixed artillery gun with an initial speed $u$ such that it hits the target on the ground at a distance $R$ from it. If $t_{1}$ and $t_{2}$ are the values of the time taken by it to hit the target in two possible ways, the product $t_{1} t_{2}$ is:

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Important Questions on Kinematics

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 1>Q 14

Two guns

A

and

B

can fire bullets at speeds

1 km s^{- 1}

and

2 km s^{- 1}

respectively. From a point on a horizontal ground, they are fired in all possible directions. The ratio of maximum areas covered by the bullets fired by the two guns, on the ground is:

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 1>Q 15

The position of a projectile launched from the origin at t = 0 is given by

\vec{r} = (40 \hat{i} + 50 \hat{j}) m

at t = 2s. If the projectile was launched at an angle

θ

from the horizontal, then

θ

is (take g = 10 ms^-2).

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 1>Q 16

A body is projected at an angle of

60 °

with the horizontal such that the vertical component of its initial velocity is

40 m s^{- 1}

. The magnitude of velocity of the projectile at one quarter of its time of flight is nearly (Acceleration due to gravity

= 10 m s^{- 2}

)

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 1>Q 17

Two long parallel plates $A$ and $B$ are separated by a distance of $4 cm$ with an electric field of $45.5 V m^{- 1}$ between the plates directed normally from plate $A$ to plate $B,$ as shown in the figure. An electron is projected from plate $A$ with velocity $v$ at an angle of $30 °$ with the surface of plate $A$ . The maximum value of $v$ so that the electron does not hit plate $B$ is
$($ Assume gravity free space, charge of electron $= 1.6 \times 10^{- 19} C$ and mass of electron $= 9.1 \times 10^{- 31} kg)$

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 1>Q 18

Two towers

A

and

B

, each of height

20 m

are situated a distance

200 m

apart. A body thrown horizontally from the top of the tower A with a velocity

20 {ms}^{- 1}

towards the tower

B

hits the ground at point

P

and another body thrown horizontally from the top of tower

B

with a velocity

30 {ms}^{- 1}

towards the tower A hits the ground at point

Q

. If a car starting from rest from

P

reaches

Q

10

seconds, the acceleration of the car is _________

(

Acceleration due to gravity

= 10 {ms}^{- 2})

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 1>Q 19

A projectile is given an initial velocity of

(\hat{i} + \sqrt{3} \hat{j}) m s^{- 1},

where

\hat{i}

is along the ground and

\hat{j}

is along the vertical. Then, the equation of the path of projectile is

[

Take,

g = 10 m s^{- 2}]

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 1>Q 20

An aeroplane is flying in a horizontal direction with a velocity

u

and at a height of

2000 m

. When it is vertically below a point

A

on the ground a food packet is released from it. The packet strikes the ground at point

B

. If

A B = 3 km

and

g = 10 m s^{- 2}

, then the value of

u

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 1>Q 21

A man of height

7.33 ft

releases a stone from the slingshot just above his head. If the stone travels in a vertical direction towards the sky with velocity of

10 m s^{- 1}

, then the time it takes to reach the ground is (Assume acceleration due to gravity

g = 10 m s^{- 2}

)

A shell is fired from a fixed artillery gun with an initial speed u such that it hits the target on the ground at a distance R from it. If t1 and t2 are the values of the time taken by it to hit the target in two possible ways, the product t1t2 is:

Important Questions on Kinematics

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A shell is fired from a fixed artillery gun with an initial speed $u$ such that it hits the target on the ground at a distance $R$ from it. If $t_{1}$ and $t_{2}$ are the values of the time taken by it to hit the target in two possible ways, the product $t_{1} t_{2}$ is: