Kinematics-Average Speed and Instantaneous Velocity (NEET 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 = v1v2a

b.

t 1 = v12v222

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

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

Choices

Choice (4) Response

a.

100m/scos

b.

(100 m/s) cos

c.

(100 m/s) sin

d.

100m/ssin

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

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

The pilot maintains an eastward heading while a 20 m/s wind blows northward. The plane’s velocity is deflected from due east by what angle?

Choices

Choice (4) Response

a.

sin120100

b.

tan120100

c.

cos120100

d.

Question does not provide sufficient data or is vague

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