1. The problem statement, all variables and given/known data While running in a cross country meet, a member of the team dissipates about 0.35J of mechanical energy per step per kg of her body mass. If she develops a power of 75W during the race and runs at a speed of 5m/s, find her mass. PS: Consider one [of her] running steps to be 1m. 2. Relevant equations I am unsure what equation to use to find mass. I know the equations to find power and work, but in relation to finding mass I am unsure. 3. The attempt at a solution I cannot attempt a solution with no clue what equation to use to get me started. I am able to do the work if I have proper equations. Thanks!