Question

A rocket of mass 5.0kg is travelling horizontally with a speed of 200ms-1 when it explodes into two parts.

One part of mass 3.0kg continues tin the original direction with a speed of 100ms-1 and the other part continues in the same direction.

 

 

 

Calculate the unknown speed of the other part.

 

Answer 1

Momentum conservation:

$$mv=m_1v_1+m_2v_2,\\\space\\ v_2=\frac{mv-m_1v_1}{m_2}=233\text{ m/s}.$$