The coefficient of friction between the flat bed of the truck and the crate it carries is 0.30. Determine the minimum stopping distance s, which the truck can have from a speed of 70 km/h with constant deceleration if the carate is not to slip forward. What is `(S)/(13)`?

Answer

3

Explanation

`vec(v)_(m)=vec(v)_(r )-vec(r )_(m)impliesv_(m)=sqrt(v_(r )^(2)+v_(m)^(2)+2v_(r )v_(m)cos60^(@))` and `phi =tan^(-1)[v_(m)sin60^(@))//(v_(r)+v_(m)cos60^(@))]` where `v_(m)=1.5m//sec` and `v_(r )=3m//sec`