# Work, Energy and Power-Potential Energy (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 6 - 9 of 11

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## Question number: 6

» Work, Energy and Power » Potential Energy

Assertion-Reason▾

### Assertion (Ꭺ)

A particle moves along a straight line with constant velocity. Now a constant non-zero force is applied on the particle in direction opposite to its initial velocity. After the force is applied, the net work done by this force may be zero in certain time intervals.

### Reason (Ꭱ)

The work done by force acting on a particle is zero in any time interval if the force is always perpendicular to velocity of the particle.

### Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are false

d.

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

## Question number: 7

» Work, Energy and Power » Potential Energy

MCQ▾

### Question

A tennis ball dropped from a height of 3 m rebounds only 1.6 meter after hitting the ground. What fraction of energy is lost in the impact?

### Choices

Choice (4) Response

a.

0.466

b.

1.26

c.

2.45

d.

0.233

## Question number: 8

» Work, Energy and Power » Potential Energy

MCQ▾

### Question

A body of mass 1 kg initially at rest explodes and breaks into three fragments of masses in the ratio 1: 1: 3. The two pieces of equal mass fly off perpendicular to each other with a speed of 30 m/sec each. What is the velocity of the heavier fragment?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 9

» Work, Energy and Power » Potential Energy

MCQ▾

### Question

A particle of mass 4 m which is at rest explodes into three fragments two of the fragments each of mass m are found to move each with a speed v making an angle 90° with each other. The total energy released in this explosion is –

### Choices

Choice (4) Response

a.

b.

c.

d.

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