Q. 165.0( 2 Votes )

A girl riding a b

Answer :

Let m1 and m2 be the mass of girl with bicycle and stone respectively i.e. m1=50kg & m2=0.5kg

Also we have given u1=5m/s, u2=5m/s and v2=15 m/s and we have to find v1


As we know by law of conservation of momentum


initial momentum (girl, bicycle, stone) =final momentum (cycle and girl) + stone


i.e.






Therefore, the speed of cycle and girl decreased by



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