Question

1. units of measurement used to label a quantity of acceleration are: *

a. cm2/sec.
b. sec2/cm.
c. cm/sec.
d. cm/sec2.

1. the rate of change in the speed of an object is known as: *

a. velocity.
b. displacement.
c. acceleration.
d. equilibrium.

Explanation:

For question 2:
Acceleration is defined as the change in velocity over time. Velocity has units of length over time (e.g., cm/sec), and when we take the change in velocity (which is also length over time) and divide by time (sec), we get units of length over time squared. So, cm/sec².
For question 3:
Acceleration is specifically the rate of change of speed (or velocity). Velocity is speed with direction. Displacement is a measure of how far an object is from its starting point in a straight - line. Equilibrium is a state where forces are balanced.

Answer:

1. d. cm/sec2
2. c. acceleration