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Energy is the currency of transformation. All systems remain the same unless energy is exchanged between one part and another. Learn here about the energy associated with movement.

An \(8\)-ton truck traveling at \(20\text{ m/s}\) hits a parked car of mass \(2000\text{ kg}\) from behind. If the collision is perfectly inelastic, what is the approximate total loss in kinetic energy?

Assume that the road is frictionless and ignore the deformation of the vehicles.

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A wooden block of mass \(4.8\text{ kg}\) is at rest on a frictionless floor. A bullet of mass \(0.2\text{ kg}\) is fired at \(500\text{ m/s}\) towards the block. If the bullet becomes embedded inside the block, how much kinetic energy is lost?

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