Help me to answer physic question?

Question

help me to solve this physic question?

an object with mas 2.1 kg is pushed upward an inclined plane by a force F,as shown in figure.if the object moves with constant velocity,calculate

a)the force F

B)work done by the force F if the object moves on :

a plane with coefficient friction = 0.2

the figure u can view from this link http://i21.photobucket.com/albums/b266/orizim/Image013.jpg notes.distance = 2.65m

angle = 20 degree

Answer 1

the first answer is not correct.

i will send u mail the answer to you.

Answer 2

well since you stated that the body is moving with constant velocity, it means that the body has no acceleration. however for there to be a force there must be acceleration since force is the product of mass and acceleration. so then zero acceleration is going to mean that there is no forceacting on the object and as such the total work done on the object is Zero