Hitting your head at 15 mph
a. has the same force of impact as being hit with a sledgehammer.
b. will rarely cause injuries.
c. has the same force of impact as being hit with a softball.

Answer – A In auto crashes, even low driving speed can cause serious injury or death. For instance, hitting your head at 15 miles per hour (24 kilometers per hour) has the same force of impact as being hit with a sledgehammer, or even worse.