1. The problem statement, all variables and given/known data A barrel of oil with a mass of 65 kg is rolled down a 1.2 m ramp. Due to a constant force exerted on it, the barrel reaches a velocity of 4.2 m/s just on leaving the ramp. Find the constant force on the barrel while it is on the ramp and express your answer in the form of a sentence relating force, change in velocity, distance, and direction. 2. Relevant equations f=ma, v=d/t, a=v/t, 3. The attempt at a solution i have no idea how to even start this question. should i find the time to plug it into the a=v/t formula, then use that to put it into the f=ma formula? how do i find change in velocity, distance and direction??