1. I drop two objects straight down from a balcony at some height above the ground, carefully releasing them at exactly the same moment. One is a 1lbs steel ball, the other a steel ball of 10 lbs. Which lands first?

a. The 1lbs ball.

b. The 10 lbs ball.

c. They land at the same time.

2. A big 18-wheel truck collides head-on with a fly on I-25. The 18-wheeler was going at 70 miles/hr to the north, the fly at 2ft/sec to the south. Which of the following describes the situation best?

a. The fly barely survived the collision.

b. The fly exerted a larger force on the 18-wheeler than the 18-wheeler on the fly during the collision.

c. The 18-wheeler exerted a larger force on the fly than the fly on the 18-wheeler during the collision.

d. The forces exerted by the two bodies on each other were equal.