20 pc This diagram represents a multi-flash photograph of an object moving
along a horizontal surface. The positions as indicated in the diagram are
separated by equal time intervals. The first flash occurred just as the
object started to move and the last flash just as it came to rest.
Which of the following graphs best represents the object's acceleration as a function of time?
(B)
(D)

A
B

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?