In an inelastic collsion
(a) the initial kinetic energy is equal to the final kinetic energy
(b) the final kinetic energy is less than the initial kinetic energy
(c) the kinetic energy remains the constant
(d) the kinetic energy first increases then decreases.
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(b) the final kinetic energy is less than the initial kinetic energy
Explanation:
If the collision is perfectly inelastic the deformation of the bodies during the collision is permanent and the part of initial kinetic energy lost in deformation is not recovered. As a result, the final kinetic energy is less than the initial kinetic energy.
If the collision is partly inelastic, the deformations of the bodies are partly recovered and still a part of the initial kinetic energy remains utilized in the partial deformation. Hence here again the final kinetic energy is less than the initial kinetic energy. Though the difference, in this case, is less than the perfectly inelastic collision.
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