# Kinematics-Average Speed and Instantaneous Velocity (NEET Physics): Questions 68 - 72 of 108

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## Question number: 68

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

### Question

A car of 1000 kg moving with a velocity of 18 km/hr is stopped by the brake force of 1000 N. The distance covered by it before coming to rest is –

### Choices

Choice (4) Response

a.

12.5 m

b.

144 m

c.

1 m

d.

162 m

## Question number: 69

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

### Question

A body of mass 20 kg moving with a velocity of 3 m/s, rebounds on a wall with same velocity. The impulse on the body is -

### Choices

Choice (4) Response

a.

60 Ns

b.

120 Ns

c.

30 Ns

d.

180 Ns

## Question number: 70

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

### Question

A ship is steaming towards east at a speed of 12 ms -1. A woman runs across the deck at a speed of 5 ms -1 in the direction at right angles to the direction of motion of the ship i. e. towards north. What is the velocity of the woman relative to sea?

### Choices

Choice (4) Response

a.

12 m/s

b.

5 m/s

c.

13 m/s

d.

17 m/s

## Question number: 71

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

### Question

Consider two children riding on the merry-go-round Child 1 sits near the edge, Child 2 sits closer to the center. Let V1 and v2 denote the linear speed of child 1 and

Child 2, respectively. Which of the following is/are wrong?

Select the correct answers and mark it according to the following codes:

(1) We cannot determine V 1 & V 2 without more information

(2) v 1 = v 2

(3) v 1 < v 2

(4) v 1 > v 2

### Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

1 and 2 are correct

c.

1 and 3 are correct

d.

2 and 4 are correct

## Question number: 72

» Kinematics » Average Speed and Instantaneous Velocity

Assertion-Reason▾

### Assertion (Ꭺ)

A river is flowing from east to west at a speed of 5m/min. A man on south bank of river, capable of swimming 10 m/min in still water, wants to swim across the river in shortest time. He should swim due north.

### Reason (Ꭱ)

For the shortest time the man needs to swim perpendicular to the bank.

### Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

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

c.

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

d.

Both Ꭺ and Ꭱ are false