A boy of mass runs along a straight track at

PHYSICS · Subjective · CBSE · Physics · Work and Energy · Work and Energy

Problem

A boy of mass

50\,\text{kg}

runs along a straight track at

5\,\text{m/s}

. Calculate the kinetic energy possessed by the boy. After sprint practice, his speed increases to

8\,\text{m/s}

. Without re-calculating from the beginning, determine by what factor his kinetic energy has increased and then compute its new value.