A sprinter has a mass of 80 kg and a kinetic energy of 4000 J. What is the sprinter's speed?

Answer 1

Since we are given the sprinter's kinetic energy and her mass, we can figure out her velocity by using this formula:

KE = 0.5mv²

Step 1:

Substitute the known values into the formula: 4000 J = 0.5 (80kg) v²

Step 2:

4000 J = (40kg) v²

Step 3:

v² = 100

Step 4:

v = 10 m/s