Question

give an example of a motion in which acceleration of an object is against the direction of motion ​

Answer 1

Answer:

When a ball is thrown vertically upward

Explanation:

We know acceleration due to gravity is always in downward direction. So when a ball (object) is thrown vertically upward direction it's motion is in upward but gravity is in downward direction.

Means that motion of the object is opposite to the it's acceleration.

Here, as acceleration is opposite to the direction of motion thus we call this declaration or retardation.

And we take negative sign before the magnitude of acceleration, to show it.