A plank P (mass twice the block Q) and a negligible-size block Q move on a smooth table with velocities 3 m s⁻¹ and 6 m s⁻¹ in the same direction. Plank length is 1 m. When Q reaches the far end it just stops slipping relative to P. Find coefficient of friction.

Physics · Center of maas , Momentum and Collision · velocity and acceleration of center of mass,newton second law for system

JEE Advanced

A plank P (mass twice the block Q) and a negligible-size block Q move on a smooth table with velocities 3 m s⁻¹ and 6 m s⁻¹ in the same direction. Plank length is 1 m. When Q reaches the far end it just stops slipping relative to P. Find coefficient of friction.

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