A car of 700 kg moving with a velocity of 10 m/s. A motor bike of 120 kg
also moving with same speed in the same direction lying behind 10 meter
from the car. What is there collision velocity?(
"u(m_1+m_2)=vm_1+vm_2,"
"u=\\frac{vm_1+vm_2}{m_1+m_2}=10~\\frac ms."
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