The radius of the wheel on a car is 27 inches. If the wheel is revolving at 392 revolutions per minute, what is the linear speed of the car, in miles per hour?.

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?