Newton's laws and momentum

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Question 10
Hard

Two blocks of masses 3m and m m\,m are connected by a light, inextensible string that passes over a smooth, fixed pulley, as shown in the diagram.

Atwood machine

The system is released from rest under gravity, ggg.

Assuming neither block reaches the pulley or the ground within the time interval ttt, which of the following expressions represents the magnitude of the total momentum of the two-block system at time ttt?

12mgt\frac{1}{2} mgt21​mgt

mgtmgtmgt

2mgt2mgt2mgt

4mgt4mgt4mgt

Newton's laws and momentum Questions

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