Which of the following statements `is//are` correct ?

Options

A. If the velcity of a body changes, it must have some acceleration.
B. If the speed of a body change, it must have some acceleration.
C. If the body has acceleration, its speed must change.
D. If the body has acceleration. Its speed may change.

Answer

A, B, D

Explanation

`a=dv//dt`, if velocity changes, definitely there will be acceleration. If speed changes, then velocity also changes. So definitely there will be acceleration. Acceleration, may be due to change in the direction of velocity only and not magnitude. If body has acceleration ofvelocity.