Jocko the clown, whose mass is 60-Kg, stands on a skateboard. A 20-Kg ball is thrown at Jocko at 3m/s, and when he catches the ball, he and the ball move on the skateboard. How fast do Jocko and the ball move after he catches the ball?

The speed of the Jocko and the ball move after he catches the ball is 0.75 m/s.

Given that,

Based on the above information, the calculation is as follows:

Here we used the conservation of momentum:

= 0.75 m/s

Therefore we can conclude that the speed of the Jocko and the ball move after he catches the ball is 0.75 m/s.

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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.

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