Stuck on some Physics, help please (Work and Energy)?

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Marcelgluch
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Stuck on some Physics, help please! (Work and Energy)?

K this first one I am not sure how to do it.. i did the second part, that's because i had all the variables but in this one i dont...

ok this is about skeleton racers... the track total height is 104m, in the absence of nonconservative forces, such as friction and air resistance, what would be the speed of a rider at the bottom of the track? ignore initial velocity since its relatively small.

and

In 2.0min a ski lift raises four skiers at constant speed to a height of 140m. the average mass of each skier is 65kg. what is the average power provided by the tension in the cable pulling...

i know what to but i just can't figure out the Work... i know that power = work/time.. so if i could get some help that would be greatly appreciated!
 
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can someone please help me understand these two problems??