How does the elasticity of a collision depend on initial Kenetic energy and is this influenced by the material of the object?

Have table of results made from the experiment, where two balls are colliding. Three types of balls were taken for the experiment-squash balls, golf balls and steel balls. The mechanism of colliding was similar to Newton’s cradle. Each ball was dropped from heights ranged 20-75 and afterwards with the help of the video was 2 height collected. The data is included in files and the marscheme as well which should be followed. Graphs should be done as well as calculations, simple ones.

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