A load of steel of mass 6000 kg rest on a flat bet truck. It is held in place by metal brackets which can exert a maximum horizontal force of 8000 N. When the truck is traveling 20 m/s, what is the minimum stopping distance if the load is not to slide forward into the cab?
This text should have mentioned that you are to neglect the friction.
If the friction were included, its coefficient should have been given in the text.
I therefore neglect the friction in the solution.
I also recommend to take some notations before presenting the solution:
Let m = 6000 kg be the mass of the steel load,
let F = 8000 N be the maximum force that the metal bracket can exert,
and let v_0=20 m/s be the speed at the instant the driver starts braking,
and let the direction of motion of the truck to ...