# Kinematics (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 42 - 45 of 233

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## Question number: 42

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

### Question

An express train is moving with a velocity v 1. Its driver finds another train is moving on the same track in the same direction with velocity v 2. To escape collision, driver applies a retardation a on the train, the minimum time of escaping collision will be

### Choices

Choice (4) Response

a.

t =

b.

t 1 =

c.

t1 = t-t1

d.

All of the above

## Question number: 43

» Kinematics » Motion in a Plane

MCQ▾

### Question

A man throws balls with the same speed vertically upwards, one after the other at an interval of 2 seconds. What should be the speed of the throw so that more than two balls are in the sky at any time? (Given g = 9.8 m/s2)

### Choices

Choice (4) Response

a.

At least 0.8 m/s

b.

Only with speed 19.6 m/s

c.

More than 19.6 m/s

d.

Any speed less than 19.6 m/s

## Question number: 44

» Kinematics » Motion in a Straight Line

MCQ▾

### Question

A ball is thrown vertically upwards. Which of the following graphs represent velocity-time graph of the ball during its flight? (Air resistance is neglected)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 45

» Kinematics » Motion in a Straight Line

Assertion-Reason▾

### Assertion (Ꭺ)

The position-time graph of a uniform motion in one dimension of a body can have negative slope.

### Reason (Ꭱ)

When the speed of body decreases with time, the position-time graph of the moving body has negative slope.

### Choices

Choice (4) Response

a.

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

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