Question

Suppose a car being lifted by a crane has gravitational potential energy of `7.7 * 10^4` Joules when it's 7.1 meters above the ground. What is the mass of the car?

Answer 1

The car's mass is approximately `1.1 * 10^3` kilograms.

Explanation:

I'm assuming that you mean to say the gravitational potential energy is `7.7 * 10^4 J`

Gravitational potential energy is given by `E = mgh`.

`7.7 * 10^4 J = 7.1(9.8)m`

`0.11 * 10^4 kg = m`

`1.1 * 10^3 kg= m`

Hopefully this helps!