A 1-kg ball dropped from 2 m rebounds only 1.5 m after hitting the ground. The amount of energy converted to heat is about

Question

Quizplus · Accepted Answer

The energy initially is the potential energy at 2 m, which is $mgh = 1 \times 9.8 \times 2 = 19.6 \, \text{J}$. After rebounding to 1.5 m, the energy is $1 \times 9.8 \times 1.5 = 14.7 \, \text{J}$. The difference, $19.6 - 14.7 = 4.9 \, \text{J}$, is the energy converted to heat, which is more than 2.0 J.

A 1-Kg Ball Dropped from 2 M Rebounds Only 1