Question

A ball is thrown vertically upwards from the top of a tower with a velocity of 20 metre per second the ball strikes the earth after 5 second of destroying what is the height of the tower hi what will the best city or the ball one is taking the earth

Answer 1

v=20m/s
t=5secs
a= (v-u)/t
= 20-0/10 = 2m/s^2
height = at^2+ut
= -2× 100 + 20× 10
= 200+200= 400 m