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What is the equation for potential energy?

m * g * y

Correct. So what is the potential energy when y = 20?

So 1 = 9800 J
and 2 = 39200J
but with 3 i subract 39200 - 9800?

Yes, yes, and yes!

@nikkysterr: don't forget eashmore some medals for his help!

whooo ! alright but it confuses me when it comes to "object at rest"

0?

Correct. So what is the total mechanical energy?

Mechanical Energy is zero.

I'm having some internet trouble. Forgive me if my responses are delayed.

no problem i appreciate your help.

physics isnt my strongest subject.

so mechanical energy isnt zero?

Nope. It is equal to potential energy in this case.

Oh so the mechanical energy would be the Potential Energy?

for the amount of work how do i find the force?

i know i have the distance 80 [100-20]

but i need the force. to get the work.

the work force is equal to the PE.

Work is equal to the same answer we got for number 3.

because i was thinking w = f times d.
and force = mass times acceleration
i

so it would be 9800J = f * 80?

thank you so much for your help ! i appreciate it !