Question

Two balls A and B are thrown simultaneously, A vertically upwards with a speed of 20 m/s from the ground ,and B vertically downwards from a height of 40m with the same speed along the same line of motion ,at what point do the balls collide?

Answer 1

Maximum height of ball A is 20m and total height of building is 40 m so height of collision is :
Height of building=height at collision + max. height of ball A
40m= height +20m
Height at collision= 40m-20m
20m Ans