Question

A 35-kg boy is riding an 18-kg bicycle down a path. If the bicycle is moving at 11 m/s, what is the kinetic energy of the boy and the bicycle?

Answer 1

3206.5 Joules

Explanation:

Given:

Mass boy = M = 35 kg

mass bicycle = m = 18 kg

v = 11 m/s

We write the formula for kinetic energy and substitute known ones to determine the kinetic energy of the boy and the bicycle, just like this:

`\begin{gathered} E=(1)/(2)\cdot(M+m)\cdot v^2 \\ \text{ Replacing} \\ E=(1)/(2)\cdot(35+18)\cdot11^2 \\ E=3206.5\text{ J} \end{gathered}`

The kinetic energy of the boy and the bicycle 3206.5 Joules