1 answer
(click or scroll down)
work to stop=1/2 m v^2= 750*40.9^2 joules (you multiply it )
work to stop=force*distance=force*100
set those two equal, and solve for force.
coefficent static friction....
work to stop=1500*9.8*coeffcent
set that term to equal work to stop,solve for coefficent.