PhysicsA particle of mass 1 kg is thrown vertically upward with speed 100 m/s. After 5 sec it explodes into two parts. One part of mass 400 g comes back with speed 25 m/s, what is the speed of the other part just after explosion? (g=10 m/s2)

A particle of mass 1 kg is thrown vertically upward with speed 100 m/s. After 5 sec it explodes into two parts. One part of mass 400 g comes back with speed 25 m/s, what is the speed of the other part just after explosion? (g=10 m/s2)

  1. A

    600 m/s upward

  2. B

    100 m/s upward

  3. C

    100 m/s down ward

  4. D

    300 m/s upward

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    Solution:

    Velocity after 5 sec v=ugt=10010(5)=10050=50Applying conservation of mometum mv=m1v1+m2v21000×50=(400)(25)+600v250000=10.000+600v260,000=600v2 v2=100m/s

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