energy problem

[Lilly]

hi,
i need some help w/ this problem:
a) A block of mass 2.00 kg is pushed 2.32 m along a frictionless horizontal table by a constant 17.7 N force directed 25.5 degbelow the horizontal. Determine the work done by the applied force.
b) Determine the magnitude of the normal force exerted by the table.

For part a i used the formula W= Fcos(theta) delta X and i keep coming up with the answer 37.1 joules. It's not right though, and i don't know what i'm doing wrong. help please. thanks. lilly

[Doc Al]

It looks right to me. What makes you think it's wrong?

[Lilly]

it's wrong because there is this website for my physics class where we have to post our answers to the questions and it won't accept an answer unless its right. and my answer is not being accepted, so it must be wrong....