# If an object is mass m with a velocity u collides with a stationary object of mass m, how much kinetic energy is lost?

There will be no loss of kinetic if the collision is elastic and in all cases momentum will be conserved. If the collision is inelastic some energy is converted to heat.

When two objects collide, their kinetic energy is conserved unless part of the energy was transformed into a different form during the collision. In the event of an inelastic collision, some energy is transformed into heat but momentum is conserved. This is because energy is always conserved.

The kinetic energy has changed to:

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The kinetic energy lost in the collision is ( \frac{1}{2}m(u^2) ).

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