d. stay at rest d. one of the choices 1. An object at rest if no outside forces are applied. a. Decrease mass b. increase mass c. increase velocity 2. Newtons second law uses the formula a. A=pr2 b. E = mc2 C. F= ma 3. The SI unit for force is a. Kilograms b. meters per second C. newtons 4. The acceleration of gravity is a 89m/s2 b. 9.8m/s/s C. 0.9 m/s2 d. none of the above d. 9.28m/s2