Two identical dumbbells are fabricated by welding small identical particles each of mass m at the ends of two identical massless rods each of length l. The dumbbells are moving in free space with equal speeds u towards each other without rotation as shown in the figure. Collisions between the particles are perfectly elastic. Angular speed of each dumbbell after the first collision is:

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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.