Kinematics-Average Speed and Instantaneous Velocity (NEET Physics): Questions 83 - 87 of 108

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Question number: 83

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

body of mass 1 kg strikes elastically with another body at rest and continues to move in the same direction with one fourth of its initial velocity. The mass of the other body is –

Choices

Choice (4) Response
a.

0.6 kg

b.

2.4 kg

c.

4 kg

d.

3kg

Question number: 84

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A rifle man, who together with his rifle has a mass of 100 kg, stands on a smooth surface fires 10 shots horizontally. Each bullet has a mass 10 gm and a muzzle velocity of 200 m/s. What velocity does rifle man acquire at the end of 10 shots?

Choices

Choice (4) Response
a.

1.2 m/s

b.

0.5 m/s

c.

0.6 m/s

d.

-0.2 m/s

Question number: 85

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

The rate of burning of fuel in a rocket is 100 gm/sec. and comes out with and velocity 5 x 10 3 m/s. The force exerted by gas on rocket will be –

Choices

Choice (4) Response
a.

2.5 x l0 6 N

b.

2.5 x l0 4 N

c.

500 N

d.

300 N

Question number: 86

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A bullet of mass 10 g travelling horizontally with a velocity of 600 m/s strikes a

Block of wood of mass 590 g which rests on a rough horizontal floor. After impact the block and the bullet move together and come to rest when the block has travelled a distance of 15 m. The coefficient of friction between the block and the floor will be - (Duration of impact is very short)

Choices

Choice (4) Response
a.

½

b.

1/3

c.

2/3

d.

¾

Question number: 87

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A bullet of mass 10 g travelling horizontally with a velocity of 300 m/s strikes a

block of wood of mass 290 g which rests on a rough horizontal floor. After impact the block and the bullet move together and come to rest when the block has travelled a distance of 15 m. The coefficient of friction between the block and the floor will be - (Duration of impact is very short)

Choices

Choice (4) Response
a.

½

b.

2/3

c.

¾

d.

1/3

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