A girl of mass 50kg and with initial velocity 4 m/s jumps on a skateboard which is at rest.
So find the velocity of the entire system.

Dear Student,Mass of girl, m1 =50 kginitial velocity of the girl, u1=4 m/secLet, Mass of the skateboard be m2 kginitial velocity of the skateboard, u2=0 m/secLet v be the velocity of the system.Since no any external force is acting, therefore linear momentum of the system(girl+skateboard) will be conservedm1u1+m2u2=m1+m2vOr, 50×4+m2×0=50+m2vTherefore, v=20050+m2Regards

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