# Kinematics-Average Speed and Instantaneous Velocity (NEET (NTA)-National Eligibility cum Entrance Test (Medical) 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 =

b.

t 1 =

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

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.

b.

c.

d.

Question does not provide sufficient data or is vague

## 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.

b.

(100 m/s)

c.

(100 m/s)

d.

f Page