a. The block in Figure EX 6.12 floats on a cushion of air. It is pushed to the right with a force that remains constant as the block moves from 0 to 1. The block

A. Speeds up from 0 to 1.

B. Speeds up at first, then has constant speed.

C. Moves with constant speed from 0 to 1.

b. From 1 to 2, the size of the force steadily decreases until it reaches half of its initial value. The block

A. Continues to speed up from 1 to 2.

B. Moves with constant speed from 1 to 2.

C. Slows down.

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