Question

A ball is thrown vertically upwards with a velocity U calculate the velocity with which it falls to the earth again

Answer 1

ANSWER:
When one throws a ball upwards with velocity 'u' its velocity decreases due to downward gravitational pull. It will reach a point where its velocity becomes zero.
Let the time taken by the ball to fall down from a height be 't'.
Using,v=u+gt
v=0+(9.8)t
v=9.8tm/s^2