A block of mass 290 kg slides on a frictionless plane inclined at 39◦ with the horizontal
under the influence of a restraining force of 1643 N acting parallel to the incline and up the incline. The acceleration of gravity is 9.8 m/s^2

What is the magnitude of the acceleration of the block? Answer in units of m/s^2

The resulting motion is
1. down the plane, since the acceleration is
positive.
2. up the plane, since the acceleration is
negative.
3. undetermined.