Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 24

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IMPORTANT

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A projectile is projected vertically upward. The time of ascent of the projectile is $2 s$ . The time of descent of the projectile is

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Important Questions on Kinematics

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 25

At what angle

θ

to the horizontal should an object is projected so that the maximum height reached is equal to the horizontal range?

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 26

Two bullets are fired simultaneously, horizontally and with different speeds from the same place. Which bullet will hit the ground first?

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Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 27

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

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 28

A body is projected horizontally from the top of a tower of height

180 m

with a velocity of

20 {ms}^{- 1}

. If acceleration due to gravity is

10 {ms}^{- 2}

then match the following.

List-I		List-II
$(A)$	Velocity of the body after $1$ second $($ in ${ms}^{- 1}$ )	(I)	$5$
$(B)$	Horizontal displacement of the body after $1$ second (in meters)	(ii)	$20$
$(C)$	Vertical displacement of the body after $1$ second (in meters)	(iii)	$10$
$(D)$	Vertical velocity of the body after $1$ second $($ in ${ms}^{- 1}$ )	(iv)	$22.4$

The correct answer is

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 29

Two projectiles

A

and

B

are projected with the same initial speed.

A

is launched at an angle

ϕ

with the horizontal and

B

at an angle

ϕ

with the vertical. If

A

has a range

R_{1}

and

B

has a range

R_{2}

, then

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 30

Maximum range of a projectile of mass

1 kg

fired at an angle of

45 °

with the horizontal is

50 m

. If a projectile of mass

2 kg

is fired at an angle of

45 °

with the horizontal, then the maximum range of the projectile is

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 31

Train

A

is moving with a speed of

40 km h^{- 1}

from North to South and train

B

is moving with a speed of

30 km h^{- 1}

from South to North along the parallel track. The relative velocity of train

B

with respect to the train

A

is