As part of a safety investigation, two 1800 kg cars traveling at 21 m/s are crashed into different barriers.
A. Find the average force exerted on the car that hits a line of water barrels and takes 1.3 s to stop.(Express your answer to two significant figures and include the appropriate units)
B. Find the average force exerted on the car that hits a concrete barrier and takes 0.10 s to stop.(Express your answer to two significant figures and include the appropriate units)