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A 1 kg book is dropped from 10m. Its kinetic energy when it is 3m above...

A 1 kg book is dropped from 10m. Its kinetic energy when it is 3m above the ground is.

A car od mass 2kg is moving at speed of 5m/s when collides with the second car of mass 3 kg which is at rest. The 2 cars lock together and move along the road. What is the speed of the cars immediately after the collision?

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