A student who weights 500 n climbed the stairs the first floor to the third floor, 15 m above, in 20 sec.
how much work did she do?
what was her power?

Aplayer uses a hockey stick to push a puck at a constant velocity across the ice. the weight of the puck is 170 n. the coefficient of friction is 0.0600. with what force must the player push the puck so that his force just equals the frictional force? 28.3 n 0.999 n 0.102 n 0.0104 n