A cart A of mass 50 kg moving at a speed...

A cart A of mass 50 kg moving at a speed of 20 km/h hits a lighter cart B of mass 20 kg moving towards it at a speed of 10 km/h. The two carts cling to each other. Find the speed of the combined mass after the collision.

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This is an eample of inelastic collision. As the carts move towards each other, their momenta have opposite sign. If the common speed after the collision is v , momentum conservation gives
`(50kg)(20km/h)-(20kg)(10 km/h)=(70kg)V`
or `V=80/7km/h`.

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