Question

A 10-Newton object moves to the left at 1 m/s. Its kinetic energy is approximately Joules if you double the speed.

a. 0.5 b. 1 c. 10 d. 20

Answer 1

The kinetic energy

$$E_k=\frac{mv^2}{2}=\rm\frac{1\: kg*(1\: m/s)^2}{2}=0.5\:J$$

Answer: a