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.
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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 the direction of displacement. poter does work as his component of force in direction of displacement.
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