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

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?

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Thành Đạt 3 years 2021-08-06T19:07:58+00:00 1 Answers 61 views 0

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  1. Gerda
    0
    2021-08-06T19:09:52+00:00
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    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.

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