Question

1. a car with a mass of 1500 kg is moving at a speed of 20 m/s. what is its kinetic energy?

givens:
( m = )
( v = )
equation to use:
unknown: what are you solving for?
substitute & solve:

Explanation:

Step1: List given values

$m = 1500\ \text{kg}$, $v = 20\ \text{m/s}$

Step2: State kinetic energy formula

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

Step3: Substitute values into formula

$$KE = \frac{1}{2} \times 1500\ \text{kg} \times (20\ \text{m/s})^2$$

Step4: Calculate step-by-step

First compute $(20\ \text{m/s})^2 = 400\ \text{m}^2/\text{s}^2$
$$KE = \frac{1}{2} \times 1500 \times 400\ \text{kg·m}^2/\text{s}^2$$
$$KE = 750 \times 400\ \text{J}$$

Answer:

$300000\ \text{J}$ (or $3.0 \times 10^5\ \text{J}$)