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NEET 2000 Physics question

PhysicsSystems of Particles and Rotational MotionNEET 2000

A mass of 1 kg is thrown up with a velocity of 100 m/s. After 5 seconds, it explodes into two parts. One part of mass 400 g comes down with a velocity 25 m/s. Calculate the velocity of the other part :

Answer: (3)

Solution

Take and upward as positive. Velocity just before the explosion: upward. The explosion is caused by internal forces, so momentum is conserved: $1 × 50 = 0.4 × (-25)

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Question ID VK-088537