Question

A loaded tractor-trailer with a total mass of 5000 kg traveling at 3.0 km/h hits a loading dock and comes to a stop in 0.64 s. What is the magnitude of the average force exerted on the truck by the dock?

Answer 1

3km/hr=3km/hr*1hr/3600sec*1000m/1km=0.83m/s

force*time=mass*changevelociyt
force= 5000*.83/.64 N = ???