During an experiment the total kinetic energy of a two-object system is constant at until

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

During an experiment the total kinetic energy of a two-object system is constant at

7.2\,\text{J}

until

t = 1.20\,\text{s}

, when a collision occurs. At

t = 1.21\,\text{s}

the graph shows the kinetic energy has fallen to

3.8\,\text{J}

, after which it remains constant. Determine the percentage of the system’s kinetic energy that was lost in the collision.