The speed of the Jocko and the ball move after he catches the ball is 0.75 m/s.
Explanation:
Given that,
Mass if Jocko, m = 60 kg
Mass of the ball, m' = 20 kg
Speed of the ball, v = 3 m/s
Let V is the speed of Jocko and the ball move after he catches the ball. The momentum of the system remains conserved. Using the conservation of momentum as :
So, the speed of the Jocko and the ball move after he catches the ball is 0.75 m/s.