Question

A sprinter had a mass of 80 kg and a kinetic energy of 4,000 J. What is the sprinters speed?

Answer 1

K.E = 1/2mv²

4000 = 1/2 ˣ 80 ˣ v²

4000 ˣ 2 = 80 v²

8000 = 80 v²

8000/ 80 =v²

100 = v²

Taking square root on b/s

√100 = √v²

10 = v