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Question

Which of the following is not in uniform motion?

A

A bullet travelling with a constant speed in a straight line.

B

A swinging pendulum

C

The earth rotating about its axis

D

Both B & C

Medium

Solution

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Correct option is
B

A swinging pendulum

As the bullet has a constant speed and is travelling in a straight line, so it will have a constant velocity and hence it is in uniform motion
A swinging pendulum is under the action of gravitational force and is also changing its direction, hence it is not in uniform motion.
The rotation of the earth in non accelerated motion and hence it is a uniform motion 

Hence, correct answer is option

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