# Kinematics-Average Speed and Instantaneous Velocity (NEET Physics): Questions 13 - 17 of 108

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## 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: 13 (3 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.

## Question number: 14

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

### Question

The length of second’s hand in watch is 1 cm. The change in velocity of its tip in 15 seconds is

### Choices

Choice (4) Response

a.

zero

b.

cm/sec

c.

cm/sec

d.

cm/sec

## Question number: 15

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

### Question

A person aiming to reach the exactly opposite point on the bank of a stream is swimming with a speed of 0.5 m/s at an angle of 120° with the direction of flow of water. The speed of water in the stream is

### Choices

Choice (4) Response

a.

lm/s

b.

0.433 m/s

c.

0.25 m/s

d.

0.5 m/s

## Question number: 16

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

### Question

A ball is fixed to the end of a string and is rotated in a horizontal circle of radius 10 m with a speed of 20 m/sec. The acceleration of the ball will be -

### Choices

Choice (4) Response

a.

30 m/s 2

b.

10 m/s 2

c.

20 m/s 2

d.

40 m/s 2

## Question number: 17

» Kinematics » Average Speed and Instantaneous Velocity

Assertion-Reason▾

### Assertion (Ꭺ)

Two projectiles are launched from the top of a cliff with same initial speed with different angles of projection. They reach the ground with the same speed

### Reason (Ꭱ)

The work done by gravity is same in both the cases.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

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