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.

The action – reaction pair of forces act on the same object with the instance of force applied. When we push the door, we apply action, and in response to which the door opens.

Explanation:

The third law of motion given by Newton was that “to every action, there is an equal and opposite reaction”. This explains the most phenomenal action undertaken on Earth.

For example, in the case given, when we pushes the door, the door is the object on which an action has been caused with force of push. In response the door, if would have been locked or stationary in action, would apply equal and opposite reactions on the person.