Answer: A 1.5 kg box is initially at rest on a horizontal
Chapter , Problem 93(choose chapter or problem)
A 1.5 kg box is initially at rest on a horizontal surface when at t = o a horizontal force F = (1.8t)i N (with t in seconds) is applied to the box. The acceleration of the box as a function of time t is given by a = 0 for 0 :S t:S 2.8 s and a = (l.2t - 2.4)i m/s2 for t> 2.8 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 suliace?
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