In a head on collision between two cars traveling at 20 m/s (44.7 mph), both cars are brought to a complete stop in 150 ms. Part A: calculate the restraining force required on a 87.2 kg passenger to remain firmly in their seat during such a head on impact. Part B: The weight of an average 175 pound adult is 778 newtons. Imagine if a person in the backseat of one of these cars chose not to wear their seatbelt and instead attempted to use their arms to hold them selves against the seat back. To visualize the strength required to accomplish this, calculate the number of average adults this person have to be able to hold up against gravity in order to accomplish this feat. The restraining forces in part a is equivalent to the combined weight of how many 175 pound adults?