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Q. Assertion A body cannot be accelerated, when it is moving uniformly.
Reason When direction of motion of the body changes, then body may have acceleration.

Motion in a Straight Line

Solution:

The uniform motion of a body means that the body is moving with constant velocity.
But if the direction of motion is changing (such as in uniform circular motion), its velocity changes and thus acceleration is produced in a body moving uniformly. Therefore, Assertion is incorrect but Reason is correct.