kinetic energy is linearly proportional to speed.
a) true
b) false
False, because,Originally Posted by babygirl
$\displaystyle e=\frac{1}{2}mv^2$
If they are linearly proportional you are impliying,
$\displaystyle \frac{\frac{1}{2}mv^2}{v}=\frac{1}{2}mv=\mbox{ konstant}$
Therefore, it is right to say,
"kinetic energy is directly proportional to the square of speed"