Question

when the body is projected vertically upward it's velocity is at the highest point is​

Answer 1

Explanation:

velocity at highest point will be 0

as body acting against gravity

that's why It's acceleration will go on decreasing and finally 0

Answer 2

This is called the acceleration due to gravity and is usually denoted by the symbol g. An object that is thrown vertically upwards decelerates under the earth's gravity. Its speed decreases until it attains a maximum height, where the velocity is zero.