If an object moves along a straight-line path at constant speed, then it must be (a) accelerating. (b) acted on by a force. (c) both of these (d) neither of these Neglecting air resistance, when you...

If an object moves along a straight-line path at constant speed, then it must be

(a) accelerating.

(b) acted on by a force.

(c) both of these

(d) neither of these

Neglecting air resistance, when you toss a rock upward, by about how much does its upward speed decrease each second?

(a) 10 m>s

(b) 10 m>s 2

(c) The answer depends on the initial speed.

(d) none of these