A massive vertical wall is approaching a man (at rest) with speed 3.5 m/s. The man throws a ball with speed 10 m/s at an angle of 37^(@) with horizontal which after completely elastic collision rebounds and reaches back directly into hands of man. Find the distance between man and wall at the time of projection of ball in metre. (g = 10m//s^(2))

A massive vertical wall is approaching a man (at rest) with speed 3.5

1.	A massive vertical wall is approaching a man (at rest) with speed 3.5 m/s. The man throws a ball with speed 10 m/s at an angle of 37^(@) with horizontal which after completely elastic collision rebounds and reaches back directly into hands of man. Find the distance between man and wall at the time of projection of ball in metre. (g = 10m//s^(2))
Answer» ANSWER :9