Kinematics (NEET 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.

Equation

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

c.

Equation

Cannot exceed 2 at any point in its path

d.

Equation

= 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 Equation 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.

Equation

b.

Equation

c.

Equation

d.

Equation

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