# Kinematics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 83 - 86 of 233

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## Passage

A particle moves along x-axis and its acceleration at any time t is a = 2 sin (πt), where t is in seconds and a is in m/s 2. The initial velocity of particle (at time t = 0) is u = 0.

## Question number: 83 (3 of 3 Based on Passage) Show Passage

» Kinematics » Motion in a Straight Line

MCQ▾

### Question

The distance travelled (in meters) by the particle from time t = 0 to t = t will be –

### Choices

Choice (4) Response

a.

- +

b.

-

c.

d.

All of the above

## Question number: 84

» 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: 85

» 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

## Question number: 86

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

### Question

A ball is projeced from O with an initial velocity 700 cm/s in a direction 37° above the horizontal. A ball B, 500 cml away from O on the line of the initial velocity of A, isl released from rest at the instant A is projected. The height! through which B falls, before it is hit by A and the directionl of the velocity A at the time of impact will respectively bel [given g = 10 m/s2, sin 37° = 0.6 and cos 37° = 8.0]

### Choices

Choice (4) Response

a.

245 cm, 20° 44

b.

300 cm, 27° 43

c.

255 cm, 27° 43

d.

250 cm, 28° 42

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