Acrash test dummy is inside a test car moving at 55 km/h. how fast is the dummy moving relative to the seat he is sitting in?

In what direction does an applied force move an object

Which word expression describes how much to calculate pressure

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?