Question

Name:

Answer 1

Answer:

Kinetic energy is 1000 J.

Explanation:

Given:

Mass of the bicycle, $m=80\textrm{ kg}$

Distance traveled, $d=100\textrm{ m}$

Time of travel, $t=20\textrm{ s}$

Unknowns:

Speed of the bicycler, $v$.

Kinetic energy of the bicycler.

Equation:

Speed of the bicycler is, $v=\frac{d}{t}=\frac{100}{20}=5\textrm{ m/s}$

Therefore, the kinetic energy of the bicycler is given as,

$KE=\frac{1}{2}mv^{2}$

Substitute:

Plug in 5 m/s for $v$ and 80 kg for $m$. Solve for KE.

Solve:

$KE=\frac{1}{2}\times 80\times (5)^{2}\\KE=40\times 25=1000\textrm{ J}$

Therefore, his kinetic energy is 1000 J.