Question

Saying that Ken pushed his 100-kg body up to 12 meters stairwell in 10 seconds. If this were the case, we could estimate Ken's power rating. It can be assumed that Ken must exert 900-Newton downward force upon the stairs to elevate his body. By doing so, the stairs would push upward on Ken's with just enough force to lift his body up the stairs.​

Answer 1

Answer:

boy swimming in a tank is doing work as force is applied in a direction opposite to the direction of displacement. ... (g) Porter does work as component of force is in direction of displacement.