Question

Which runner has greater kentic energy : a 46-kilogram runner moving at a speed of 8 meters per second or a 92-kilogram runner moving at a speed of 4 meters per second?

Answer 1

Answer: First runner has more kinetic energy

Explanation:

The formula for kinetic energy is defined to be:

$KE=\frac{1}{2} mv^2$

Plug in the value for each runner to get:

$KE_1=0.5(46kg)(8m/s)^2=1472J$

$KE_2=0.5(92kg)(4m/s)^2=736J$