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Can anyone help me solve these problems.

The pictures are on the website given on the bottom.

Q1) What is the Ek at the upper level

b) What is the loss in Eg if the box goes from upper level to lower level

c) What is the speed of the box at the lower level.

d) What will the cofficent of friction be if the box stopped in 25m.

Q2) a) What is the total resistance.

b) What is the total current.

http:/lora_polly.tripod.com/

Please help me I am really stuck I have to prepare these for my exam thanks in advance.

Daisy