# Kinematics-Average Speed and Instantaneous Velocity (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 65 - 68 of 108

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## Question number: 65

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

### Question

A swimmer who can swim in a river with speed mv (with respect to still water) where v is the velocity of river current, jumps into the river from one bank to cross the river. Then

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

(1) If m < 1 he cannot cross the river

(2) If m < 1 he cannot reach a point on other bank directly opposite to his starting point.

(3) If m > 1 he can reach a point on other bank

(4) He can reach the other bank at some point, whatever be the value of m.

### Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1,2 and 3 are correct

c.

2 and 4 are correct

d.

1 and 3 are correct

## Question number: 66

» Kinematics » Average Speed and Instantaneous Velocity

Assertion-Reason▾

### Assertion (Ꭺ)

Rain is falling vertically downwards with velocity 6 km/h. A man walks with a velocity of 8 km/h. Relative velocity of rain w. r. t. the man is 10 km/h.

### Reason (Ꭱ)

Relative velocity is the ratio of two|velocities.

### Choices

Choice (4) Response

a.

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

b.

Both Ꭺ and Ꭱ are false

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: 67

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

### Question

A body of mass 0.05 kg falls from a height of 5 meter into a pile of sand. The body penetrates the sand a distance of 5 cm before stopping. What force has the sand exerted on the body?

### Choices

Choice (4) Response

a.

-49 N

b.

- 19.6 N

c.

-196 N

d.

0.196 N

## 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