Driving at safe speed

Asked by maham237 @ 31/12/2020 in Physics viewed by 462 People

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

Answered by maham237 @ 31/12/2020

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

In fact, the kinetic energy of a moving object is given by
$K= \frac{1}{2}mv^2$
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.

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