heres this question: theres a man who does 20 press-ups (ie facing down body straight) in 50 sec what is his power output? is it 20/50 = 0.4 press-ups per sec of power? i know power is in watts and its P = Fv = E/t if i take accleration to be 9.8 i could get v, a= (v-u)/t initial vel would be 0 ithink but i still can't get force i require mass which im not given in the Q so should i assume a mass? or is the answer above correct? and im thinking too much into it?