Asked by Nelida Jada

What is the work needed to lift 15kg of water from well 12m deep. Assume the water has a constant upward acceleratin of 0.7m/s^2?
Answered by Henry
F = m*a = 15 * 0.7 = 10.5 N.

Work = F*d = 10.5 * 12 = 126 Joules.
Answered by Oscar
The first response is wrong because 10.5 has to be multiplied by the mass to get the force (tension) needed to lift 15kg from that distance. F-mg=ma=>F=m(g+a)=>F=15(9.8+.7)=>F=15(10.5)=157.5N
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