A table-tennis ball must not exceed of kinetic energy for safety

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

Problem

150\,\text{g}

table-tennis ball must not exceed

0.60\,\text{cal}

of kinetic energy for safety. Calculate the maximum speed the ball may have in

\text{m}\,\text{s}^{-1}

. (Take

1\,\text{cal}=4.2\,\text{J}