Question

How much kinetic energy does a paper airplane have if its going 2m/s and has a mass of 0.01 kg? 

Answer 1

By the the definition of the kinetic energy, we have:

$$KE=\dfrac{1}{2}mv^2,$$ $$KE=\dfrac{1}{2}\cdot0.01\ kg\cdot(2\ \dfrac{m}{s})^2=0.02\ J.$$

Answer:

$KE=0.02\ J.$