Kinematics-Average Speed and Instantaneous Velocity (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 9 - 12 of 108

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Question number: 9

» 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 = Equation

b.

t 1 = Equation

c.

t1 = t-t1

d.

All of the above

Question number: 10

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

Two particles move simultaneously from two points A and B, 300m apart. The particle at A starts towards B with a velocity of 25 m/s and that at B, moves normal to the former with a velocity of 20 m/s.

(1) The relative velocity of the particle at A, w. r. t. that at B is 32.02 m/s

(2) The relative velocity of the particle at A, w. r. t. that at B is 12.04 m/s

(3) They are closest to each other after 7.32 sec.

(4) They are closest to each other after 4.25 sec.

Choices

Choice (4) Response

a.

1 and 3

b.

1, 2 and 3

c.

2 and 4

d.

1 and 2

Passage

When an airplane flies, its total velocity with respect to the ground is v total = v plane + v wind’ where v plane denotes the plane’s velocity through motionless air,

And v wind denotes the wind’s velocity. Crucially, all the quantities in this equation are vectors. The magnitude of a velocity vector is often called the “speed. ”

Consider an airplane whose speed through motionless air is 100 meters per second (m/s). To reach its destination, the plane must fly east.

The “heading” of a plane is in the direction in which the nose of the plane points. So, it is the direction in which the engines propel the plane.

Question number: 11 (1 of 3 Based on Passage) Show Passage

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

If the plane has an eastward heading, and a 20 m/s wind blows towards the southwest, then the plane’s speed is -

Choices

Choice (4) Response

a.

more than 100 m/s

b.

more than 80 m/s but less than 100 m/s

c.

80 m/s

d.

100 m/s

Question number: 12 (2 of 3 Based on Passage) Show Passage

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

Let denote the answer of above question. The plane has what speed with respect to the ground?

Choices

Choice (4) Response

a.

Equation

b.

(100 m/s) Equation

c.

(100 m/s) Equation

d.

Equation

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