Question

A boy standing 20m away from a wll throws a ball so as to just cross a window at a height 15m from the ground . Find the velocity of projection of the ball

Answer 1

Answer:

velocity is 20/√3 m/s

for y_axis

s=ut+1/2gt2 u=0 a=-g

15=-5t2

t=√3

for x-axis

s=ut+1/2at2 a=0

20=ut

20=u(√3)

u=20/√3m/s