A 1.1 kg box is initially at rest on a horizontal surface when at t = 0 a horizontal force F = (1.9t ) i N (with tin seconds) is applied to the box. The acceleration of the box as a function of time t is given by a = 0for 0 2.7 s. (a) What is the coefficient of static friction between the box and the surface? (b) What is the coefficient of kinetic friction between the box and the surface? (a) Number i Units (b) Number i Units v