Question

A running back has 2,799 J of kinetic energy when he runs at a velocity of 5 m/s. What is the mass of the running back?

Answer 1

Recall,

`"KE" = 1/2 mnu^2`

Hence,

`=> m = (2*"KE")/nu^2 approx 2.0*10^2"kg"`

is the mass of the running back.