Kinematics (NEET Physics): Questions 39 - 42 of 229

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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 α 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.

(α2β2αβ)t

b.

(α2+β2αβ)t

c.

αβtα+β

d.

(α+βαβ)t

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 = v1v2a

b.

t 1 = v12v222

c.

t1 = t-t1

d.

All of the above

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