# Kinematics (NEET Physics): Questions 50 - 54 of 233

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## Question number: 50

» Kinematics » Motion in a Straight Line

Assertion-Reason▾

### Assertion (Ꭺ)

A body having non-zero acceleration can have a constant velocity.

### Reason (Ꭱ)

Acceleration is the rate of change of velocity.

### Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are false

c.

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

d.

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

## Question number: 51

» Kinematics » Motion in a Straight Line

MCQ▾

### Question

The motion of a body is given by the equation dv (t) /dt = 6.0 - 3v (t), where v (t) is speed in m/s and t in sec.

If body was at rest at t = 0

### Choices

Choice (4) Response

a.

The speed varies with the time as v (t) = 2 (1 – e -5t) m/s

b.

The magnitude of the initial acceleration is 6.0 m/s2

c.

The speed is 0.1 m/s when the acceleration is half the initial value

d.

The terminal speed is 4 m/s

## 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: 52 (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: 53 (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.

## Question number: 54 (3 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

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