Question

A boy can throw a ball vertically upward to a height of 100m. If the boy throws the ball at an angle 45 deg with ground, at what distance the ball hits the ground?

Answer 1

Answer:

maximum horizontal distance achieved if the angle of projection is 45 degrees

corresponding range u^2 / g = 200 metres

max energy with which the boy can throw is 1/2 m u^2 = 1/2 m 200 g

ball will reach max height when thrown vertically

mg h = 1/2 m 200 g

==> h = 100 metres ; this is max height