1. The problem statement, all variables and given/known data A box is hurled up an incline plane of 20 degrees at 10m/second. There is no friction. What is the velocity after 3 seconds. I know gravity and the sin of 20 degrees has to be factored in. 2. Relevant equations v=u+at. u is initial velocity, v is velocity after 3 seconds, t is time. 3. The attempt at a solution 9.81x.342=3.355ms^-2. Using the above equation I calculate -.065m/s (10-3.55x3). This does not match any of my answers. I do not know were I went off-track.