Your friend places a cup of coffee on the roof of her van while and accidently drives off with the coffee cup still on the roof.
(a) If the coefficient of static friction between the roof of the van and the coffee cup is 0.26, find what is the maximum acceleration the van can have without causing the cup to slide? Neglect the effects of air resistance.
m/s2
(b) Determine the smallest amount of time in which the man can accelerate the van from rest to 15 m/s and still keep the coffee cup on the roof?
s