Question

a 0.4 kg football is thrown at a speed of 16 m/s. how much kinetic energy does the football have? remember : $e_k = \frac{1}{2}mv^2$ $e_k = ?$ j

Explanation:

Step1: Identify given values

Mass $m=0.4\ \text{kg}$, speed $v=16\ \text{m/s}$

Step2: Substitute into kinetic energy formula

$$E_K = \frac{1}{2}mv^2 = \frac{1}{2} \times 0.4 \times (16)^2$$

Step3: Calculate step-by-step

First compute $16^2=256$, then $\frac{1}{2} \times 0.4 = 0.2$, finally $0.2 \times 256$

Answer:

$51.2\ \text{J}$