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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A metal ball of mass 2 kg moving with a velocity of 36 km/h has a head-on collision with a stationary ball of mass 3 kg. If after the collision the two balls move together, the loss in kinetic energy due to the collision is

Answer: (B)

Solution

v = 36 km/h = 10 m/s. By momentum conservation: 2(10) = 5V ⟹ V = 4 m/s. Loss in KE = ½(2)(10)² − ½(5)(4)² = 100 − 40 = 60 J.

Question ID VK-154124