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Question

What happens to the motion of any body after some time, when the directions of its velocity and acceleration are opposite to each other?



Your Answer
A

Velocity will increase continuously till acceleration becomes zero.

Your Answer
B

Velocity will decrease and body will come to rest.

Correct Answer
C

Velocity will decrease to zero, then it will start moving in the direction of acceleration.

Your Answer
D

Velocity will be changing but its speed will be the same.


Solution

The correct option is B

Velocity will decrease to zero, then it will start moving in the direction of acceleration.


From first equation of motion,

v=u+at

If acceleration is –ve,

v=uat

So velocity will decrease in magnitude and eventually become zero, after which it will start moving in opposite direction.

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