Rate of loss of potential energy

[songoku]

Homework Statement

Please see below

Relevant Equations

PE = mgh

I got answer for (a), which is 0.51 m

For (b), loss of potential energy = 35 x 9.81 x 0.51 = 175 J
Rate of loss of potential energy = 175 J / 1 s = 175 W

But the answer key is 80 W. Where is my mistake?

Thanks

 

[TSny]

I think your answer of 175 W is correct.

 

[jbriggs444]

Homework Statement:: Please see below
Relevant Equations:: PE = mgh

But the answer key is 80 W

If one were adhering to the rules of significant figures, your 175 W (175.103048... on my calculator) would round up to 180 W.

Is it possible that the answer key says "180 W" instead of "80 W"?

 

[songoku]

If one were adhering to the rules of significant figures, your 175 W (175.103048... on my calculator) would round up to 180 W.

Is it possible that the answer key says "180 W" instead of "80 W"?

Maybe it is a typo, the answer is written 80 W.

Thank you very much TSny and jbriggs444