Question

A ball hangs from a string inside a rail road car moving along a straight track. The string is observed to be inclined towards the rear of the car making a constant small angle with the vertical. It shows that the car is
a. moving with an uniform acceleration
b. moving with an uniform velocity
c. moving with uniform retardation
d. moving with an acceleration which is increasing uniformly​

Answer 1

Explanation:

b. moving with an uniform velocity

this part is correct

Answer 2

The car is moving with an uniform acceleration

Therefore, option (a) is correct.

Explanation:

• Since the string is inclined towards the rear end therefore the car is ,moving forward.

• In the frame of reference of car, there will a pseudo force F acting on the ball in the backwards direction which makes the string inclined to the vertical

• Now if the car is moving with an acceleration a and the mass of the ball is m

• Then F = ma, the force which causes the string to be inclined

• Therefore, the car is moving with a uniform acceleration

• Thus, option (a) is correct.

Hope this answer is helpful.

Know More:

Q: A ball is hanging by a string from the ceiling of the roof. draw a neat labelled diagram showing the forces acting on the ball and the string.

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