A ball is thrown vertically upwards. It goes to a height 19.6 m and then comes back to the ground, Find the final velocity of the ball when it strikes the ground.
Take g = 9.8 `m s^(-2)`

Explanation

Given , h = 19.6 m , a = - g = - 9.8 m `s^(-2)` , v = 0
The final velocity of ball when it strikes the ground will be same as the initial velocity with which it was thrown upwards.
`therefore` Final velocity on reaching the ground `= 19.6 m s^(-1)`