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

E M B I B E

Physics Crash Course NEET>Chapter 2 - Kinematics>Level 3>Q 13

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A bullet loses ${(\frac{1}{n})}^{th}$ of its velocity passing through one plank. Considering uniform retardation, the number of such planks that are required to stop the bullet can be:

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Important Questions on Kinematics

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IMPORTANT

Physics Crash Course NEET>Chapter 2 - Kinematics>Level 3>Q 14

A particle starts from origin $O$ from rest and moves with a uniform acceleration along the positive $x - a x i s$ . Identify all figures that correctly represent the motion qualitatively.
( $a =$ acceleration, $v =$ velocity, $x =$ dispalcement, $t =$ time)
$(A)$ Question Image
$(B)$
$(C)$
$(D)$

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 3>Q 15

The displacement of a particle moving with uniform acceleration in time

t

is given by

S = 30 t + 5 t^{2}

, its initial velocity is _____

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 3>Q 16

A ball is projected vertically up from ground. Boy

' A'

standing at the window of first floor of a nearby building observes that the time interval between the ball crossing him while going up and the ball crossing him while going down is

2 s

. Another boy

B

standing on the second floor notices the time interval between the ball passing him twice, during up and down motion is

1 s

. Calculate the difference between the vertical positions of boy

B

and boy

A

. (Assume

g = 10 m s^{- 2}

)

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 3>Q 17

An aircraft is moving with uniform velocity

150 m s^{- 1}

in the space. If all forces acting on it are balanced, then it will

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 3>Q 18

If

\vec{A} \times \vec{B} = \vec{C}

,

then which of the following statements is wrong?

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 3>Q 19

A particle shows the distance-time curve as shown in the figure. The maximum instantaneous velocity of the particle is around the point.

Question Image

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 3>Q 20

A car accelerates from rest at a constant rate $α$ for some time, after which it decelerates at a constant rate $β$ and comes to rest. If the total time elapsed is $t$ , then the maximum velocity acquired by the car is

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Physics Crash Course NEET>Chapter 2 - Kinematics>Level 3>Q 21

A lift starts from rest. Its acceleration is plotted against time in the following graph. When it comes to rest, its height above its starting point is

Question Image