15. An object travels in a circular orbit. If the speed of the object is doubled, its centripetal acceleration will be (a) quartered, (b) doubled, (c) halved, (d) quadrupled.
16. A single force of 35 N acts on a 7 kg block. What is the magnitude of the acceleration of the block? (a) 42 m/s^2 (b) 8 m/s^2 (c) 28 m/s^2 (d) 5 m/s^2
17. A ball with a mass of 2 kg is observed to accelerate at a rate of 6 m/s^2. What is the magnitude of the net force acting on this ball? (a) 8 N (b) 4 N (c) 12 N (d) 3 N
18. A net force of 28 N acting on a block produces an acceleration of 4 m/s^2 for the block. What is the mass of the block? (a) 6 kg (b) 32 kg (c) 7 kg (d) 24 kg
19. A 2 kg block being pulled across a table by a horizontal force of 25 N also experiences a frictional force of 15 N. What is the acceleration of the block? (a) 10 m/s^2 (b) 40 m/s^2 (c) 20 m/s^2 (d) 5 m/s^2
20. On the planet Gamma, an object with a mass of 12 kg experiences a gravitational force of 72 N. What is the acceleration due to gravity on the planet? (a) 9.8 m/s^2 (b) 10 m/s^2 (c) 6 m/s^2 (d) 60 m/s^2