A box of mass 11.7 kg rests on the flat bed of a truck; the box is not tied down in any way. The coefficients of friction between the box and the flat bed are s = 0.19 and k = 0.16. The truck stops at a stop sign and then starts to move to the West with a carelessly large acceleration of 2.15 m/s2 . A) While the truck is accelerating westward at 2.15 m/s2 , what is the East-West component of the force of friction on the box by the flat bed of the truck? Let East be positive