Question: A mass m is hanging on a string that passes over a pulley and is then attached to another mass 3 m that is resting

A mass m is hanging on a string that passes over a pulley and is then attached to another mass 3m that is resting on a horizontal table. Neglect friction. Mass m is held motionless and is then released. When it has fallen a distance h, it will have a speed v which can be calculated from the formula

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