Question

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?

Answer 1

Answer:

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 :

$m'v'=(m+m')V\\\\V=\dfrac{m'v'}{(m+m')}\\\\V=\dfrac{20\times 3}{(60+20)}\\\\V=0.75\ m/s$

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

Answer 2

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

Given that,

• Jocko the clown, whose mass is 60-Kg, stands on a skateboard.
• A 20-Kg ball is thrown at Jocko at 3m/s.
• Let us assume V be the Jocko speed.

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

Here we used the conservation of momentum:

$m'v' = (m + m')V\\\\V = \frac{m'v' }{m + m'} \\\\= \frac{20 \times 3}{60 + 20}$

= 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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