Question

1. the potential energy of a 10 kg car when it is at the top of a 45 m cliff is (a) 4,410 j (b) 1000 j (c) 45 j (d) none of the above

Explanation:

Step1: Recall potential - energy formula

The formula for gravitational potential energy is $U = mgh$, where $m$ is the mass, $g$ is the acceleration due to gravity ($g = 9.8\ m/s^{2}$), and $h$ is the height.

Step2: Substitute values

Given $m = 10\ kg$, $h=45\ m$, and $g = 9.8\ m/s^{2}$. Then $U=10\times9.8\times45$.
$U = 10\times9.8\times45=4410\ J$.

Answer:

A. 4,410 J