# Kinematics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 217 - 220 of 233

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## Question number: 217

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

### Question

A ball of mass m hits a wall with a speed v making an angle 6 with the normal. If the coefficient of restitution is e, the direction and magnitude of the velocity of ball after reflection from the wall will respectively be –

### Choices

Choice (4) Response

a.

,

b.

,

c.

,

d.

,

## Question number: 218

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

### Question

The mass of a rocket is 600 kg and the relative velocity of the gases ejecting from it is 250 m/s with respect to the rocket. The rate of burning of the fuel in order to give the rocket an initial acceleration 40 m/s 2 in the vertically upward direction (g = 10 m/s 2), will be –

### Choices

Choice (4) Response

a.

120 kg/s

b.

10 kg/s

c.

60 kg/s

d.

72 kg/s

## Question number: 219

» 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 600 m/s. What velocity does rifle man acquire at the end of 10 shots.

### Choices

Choice (4) Response

a.

0.6 m/s

b.

0.3 m/s

c.

0.5 m/s

d.

1.2 m/s

## Question number: 220

» Kinematics » Uniformly Accelerated Motion

MCQ▾

### Question

A force produces an acceleration of 10 m/s 2 in a body and same force an acceleration of 25 m/s 2 in another body. The acceleration produced by the same force when applied to the combination of two bodies will be –

### Choices

Choice (4) Response

a.

20 m/s 2

b.

3.75 m/s 2

c.

0.667 m/s 2

d.

7.142 m/s 2

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