Is the Coefficient of Restitution Constant for All Collision Velocities

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Introduction
When an object collides with another, momentum is conserved, but kinetic energy is not.
This experiment was designed to find if the coefficient of restitution, e, changes for high-velocity collisions. At low velocities colliding objects will tend to maintain their shape, size and elasticity, so e is likely to be constant over a range. However, at high velocities colliding objects may change their physical properties and therefore a change (probably a reduction) in e may be observed.
A small reduction in e was observed, but this was probably accounted for by air resistance and not a change in the material.

Theory
When a collision occurs, total momentum is conserved, but kinetic energy is not. When a ball, for example,
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It is more likely that air resistance accounts for the observation.

The experiment could be improved by increasing the drop height past 3 metres (this may increase the effect that was sought), having multiple cameras (to save time in adjusting height) and including air resistance in the theory.

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