Question

a 15 kg child slid down a slide at 2 m/s. what is the kinetic energy of the child? a 30 j b 60 j c 225 j

Explanation:

Step1: Recall kinetic - energy formula

The formula for kinetic energy is $K = \frac{1}{2}mv^{2}$, where $m$ is the mass and $v$ is the velocity.

Step2: Substitute values

Given $m = 15\ kg$ and $v = 2\ m/s$. Substitute into the formula: $K=\frac{1}{2}\times15\times(2)^{2}$.
First, calculate $(2)^{2}=4$. Then, $\frac{1}{2}\times15\times4 = 30\ J$.

Answer:

A. 30 J