# Kinematics (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 38 - 41 of 233

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## Question number: 38

» Kinematics » Motion in a Straight Line

MCQ▾

### Question

A particle of mass m moves on the x-axis as follows: it starts from rest at t = 0 from the point x - 0 and comes to rest at t = 1 at the point x = 1. No other information is available about its motion at intermediate time (0 < t < 1). If a denotes the instantaneous acceleration of the particle, then

### Choices

Choice (4) Response

a.

A cannot remain positive for all t in the interval 0 < t < l

b.

Must be > 4 at some point or points in its path

c.

Cannot exceed 2 at any point in its path

d.

= 2 at any point in its path.

## Question number: 39

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

### Question

Two trains, each 50 m long are travelling in opposite direction with velocity 10 m/s and 15 m/s. The time of crossing is

### Choices

Choice (4) Response

a.

2V√3s

b.

4s

c.

4√3s

d.

Both c. and b. are correct

## Question number: 40

» Kinematics » Motion in a Straight Line

MCQ▾

### Question

The position of a particle moving in the xy-plane at any time t is given by x = (4t 2 - 8t) metres, y = (5t 2 - 10t) metres. Select the correct statement about the moving particle from the following

### Choices

Choice (4) Response

a.

The velocity of the particle is zero at t = 1 second

b.

The velocity of the particle is zero at t = 0 second

c.

The acceleration of the particle is zero at t = 0 second

d.

The velocity and acceleration of the particle are never zero

## Question number: 41

» Kinematics » Motion in a Straight Line

MCQ▾

### Question

A car accelerates from rest at a constant rate for some time, after which it decelerates at a constant rate β and comes to rest. If the total time elapsed is t, then the maximum velocity acquired by the car is

### Choices

Choice (4) Response

a.

b.

c.

d.

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