A 3m diameter merry-go-round with a mass of 250kg is spinning at 20 rpm. John runs tangent to the merry-go-round at 5m/s, in the same direction that it is turning, and jumps onto the outer edge. John's mass is 30kg. What is the merry-go-round's angular velocity, in rpm, after John jumps on?

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Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.