Question

when the speed of the body moving in a straight line change continuously then the body aqquires
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Answer 1

Answer:

The body acquires a certain speed at an instant. It may be a speed that's higher than the original one due to accelerating force or lesser than the original due to retarding force. Remember, the acceleration or retardation may be uniform or non-uniform.

Answer 2

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The speed of the body moving in a straight line change continuously then the body is said to be in Instantaneous speed.