Question

Driving at a safe speed is particularly important because kinetic energy __________.

a. increases with the square root of speed

b. increases with the square of speed

c. decreases with the square of speed

Answer 1

The correct answer is
b. increases with the square of speed

In fact, the kinetic energy of a moving object is given by

`K= (1)/(2)mv^2`
where m is the mass of the object and v is its speed. We see that the kinetic energy is directly proportional to the square of the speed, therefore option B is the correct one.