As part of a safety investigation, two 1600 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 1.8 s to stop.
b) find the average force exerted on the car that hits a concrete barrier and takes 0.14 s to stop.

The force will determine the acceleration.

What is the magnitude of the acceleration vector which causes a particle to move from velocity −5i−2j m/s to −6i+ 7j m/s in 8 seconds. answer in m/s.

Which lists the fundamental forces in order, from strongest to weakest? strong nuclear, weak nuclear, electromagnetic, gravitational strong nuclear, electromagnetic, weak nuclear, gravitational gravitational, weak nuclear, electromagnetic, strong nuclear electromagnetic, gravitational, strong nuclear, weak nuclear