Question

An electric car is being driven through a town at 22 m/s. The kinetic energy of the car is 222640 J. Calculate the mass of the car.

Answer 1

Answer:

920 kg

You can figure this out using the equation for kinetic energy:

Given:

KE = 222640

v = 22

m = ?

\begin{lgathered}KE = 0.5mv^2\\222640 = 0.5m(22^2)\\222640=242m\\m=920\end{lgathered}

KE=0.5mv

2

222640=0.5m(22

2

)

222640=242m

m=920

Answer 2

Answer:920 kg

Explanation:

kinetic energy = 1/2 mass x speed squared

mass = 2 × kinetic energy / speed squared = 2 × 222640 J / (22 m/s) squared = 920 kg