In 2.0 minutes, a ski lift raises four skiers at constant speed to a height of 140 m. The average mass of each skier is 65kg. What is the average power provided by the tension in the cable pulling the lift?(adsbygoogle = window.adsbygoogle || []).push({});

t= 2.0min(60s/1min) = 120s

m = 65kg x 4 = 260kg

Wnc = △Ek + △Ep

Wnc = Ekf - Eki + Epf - Epi

Wnc = -mv^2 + mghf

Wnc = -1/2(v)^2 + 356720J

P = [-1/2(v)^2 + 356720J]/ 120s

i do not know v so i don't know how to solve this. have i made any errors? thanks in advance

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# Power of skier Question

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