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JEE Main202118 Mar 2021Morning ShiftPhysicsCenter of Mass, Momentum and CollisionActual

A ball of mass 10   kg moving with a velocity 10 3   m   s - 1 along the x -axis, hits another ball of mass 20   kg which is at rest. After the collision, first ball comes to rest while the second ball disintegrates into two equal pieces. One piece starts moving along y -axis with a speed of 10   m   s - 1 . The second piece starts moving at an angle of 30 ° with respect to the x -a

Correct answer

0

Step-by-step solution

Let the velocity of 2 nd  fragment is v → then by conservation of linear momentum 10 ( 10 3 ) i ^ = ( 10 ) ( 10 j ^ ) + 10 v → ⇒ v → = 10 3 i ^ - 10 j ^ | v → | = 300 + 100 = 400 = 20   m   s - 1 .

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