Sponsor Area

Work, Energy And Power

Question
CBSEENPH11017320

A body P strikes with another body Q of mass four times and at rest. The striking body starts moving with velocity 2m/s. Find the velocity with which P hits Q.

Solution
Let P hit Q with velocity u.
The velocity of Q after collision is given by, 
          space space straight v equals fraction numerator 2 straight m subscript 1 straight u over denominator straight m subscript 1 plus straight m subscript 2 end fraction 
Therefore,
Initial velocity, straight u equals fraction numerator straight v left parenthesis straight m subscript 1 plus straight m subscript 2 right parenthesis over denominator 2 straight m subscript 1 end fraction equals fraction numerator 2 left parenthesis straight m plus 4 straight m right parenthesis over denominator 2 straight m end fraction equals 5 straight m divided by straight s