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a man weighting 60 kg runs along the rails with a velocity of 18 kmh-1 and jumps into a car of mass 1 quintal [100 kg] standing on the rails .calculate the velocity with which car will start travelling along the rails.
m1=60kg
u1=18km/hr
m2=100kg
u2=0
total mass,m =m1+m2
    =160kg
m1u1+m2u2=mv
160*v = 60*18
          = 1080
       v = 1080/160
          = 6.75km/hr


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