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**very confusing :(**

i have a big assingment due april 7th , i have answered all the questions but 4 are left. can anyone help me... pleaseee :D

1. Terry uses a force of 10.0 N to push her CD player a distance of 0.50 m across a table. Calculate the amount of work she does on the CD.

2. Tony pulls his wagon a distance of 15 m across the garden while applying a force of 160 N on the wagon’s handle. If the handle makes an angle of 400 with the horizontal, how much work did Tony do on the wagon?

3. What is the kinetic energy of a 1000 kg car travelling at 25 m/s?

4. A 65 kg diver is standing on a diving platform 10.0 m above the water. What is the gravitational potential energy of the diver with respect to the water’s surface?