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Homework Statement:

i need some help with these two questions I cannot figure out the equations especially for the second one if anyone could help that would be great, thanks
1. A 65.0 kg rock is moved 12.0 m across a frozen
lake. If it is accelerated at a constant rate of 0.561 m/s^2 and the force of friction is ignored, calculate the work done.
2A roller coaster at a popular amusement park has a portion of the track that is similar to the diagram provided. Assuming that the roller coaster is frictionless, find its speed at the top of the loop.
the picture is posted for this one as well as well.
Relevant Equations:
 some of the equations i have tried to use but don't quite work are EP=mpg as as well as w=fxd