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# Power question watch

1. Jack carries a 20kg suitcase up a set of stairs in 5s
Jill caries a 12 kg suitcase up the same set in 3 s.
Find the relationship between the power exerted by Jack and Jill?
2. (Original post by jsmith6131)
Jack carries a 20kg suitcase up a set of stairs in 5s
Jill caries a 12 kg suitcase up the same set in 3 s.
Find the relationship between the power exerted by Jack and Jill?
Power is Work/Time. Time is given. What work is done by each person?
3. You must have a velocity for this question
4. (Original post by jsmith6131)
Jack carries a 20kg suitcase up a set of stairs in 5s
Jill caries a 12 kg suitcase up the same set in 3 s.
Find the relationship between the power exerted by Jack and Jill?
Power exerted by both of them is same.

Work done = Increase in potential Energy (PE)
Let height of staircase be (h), and let g be (10)
Increase in PE = mgh
Increase in PE of Jack = 20 x 10 x h
Increase in PE of Jill = 12 x 10 x h

Power = Work Done/Time

Power by Jack =
Power by Jill=

Power exerted by both of them is 40h.

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