A ball is thrown vertically upwards with a velocity u. Calculate thevelocity with which it falls to the earth again.
Given:
u = Initial velocity
Ball is thrown up
Ball goes up and attains a maximum height H and then again comes down.
Let
u = Initial Speed
v = Final Speed
t = time
a = acceleration
s = distance
Case – I
Ball is going upward
a = -g
u = u
v = 0
s = H
Since,
H = …..1
Case – II
Ball comes downward
So, u = 0
v = Final Speed
a = g
Since,
H = …..2
From equations 1 and 2, we see that,
v = u