While traveling south along a highway a driver slows from 36 m/s to 6 m/s in 10 seconds. What is the automobile's acceleration?
a. -3 m/s2
b.3.6 m/s2
X C-1 m/s2
d. 3 m/s2
e.-3.66 m/s2

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?