# Work, Energy and Power (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 21 - 23 of 63

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## Question number: 21

» Work, Energy and Power » Elastic and Inelastic Collisions

Assertion-Reason▾

### Assertion (Ꭺ)

A particle of mass m strikes a wedge of mass M horizontally as shown in the figure. If collision is perfectly inelastic then, it can be concluded that the particle sticks to the wedge.

### Reason (Ꭱ)

In perfectly inelastic collision velocity of both bodies is same along common normal just after collision.

### Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

## Question number: 22

» Work, Energy and Power » Kinetic Energy

MCQ▾

### Question

A body of mass M splits into two parts αM and (1 - a) M by an internal explosion, which generates kinetic energy T After explosion if the two parts move in the same direction as before, their relative speed will be –

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 23

» Work, Energy and Power » Work Done

MCQ▾

### Question

A particle moving in a straight line is acted by a force, which works at a constant rate and changes its velocity from u to v in passing over a distance x. The time taken will be –

### Choices

Choice (4) Response

a.

b.

c.

d.

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