4. For t 2 0, the velocity of an object is given by v(t) : t2 + 4. At t = 0 the particle is at position a: = 1. What is its displacement on the interval t = 0 to t = 3? 5. A manager of a small restaurant keeps track of the rate at which customers enter his restaurant between the hours of 11 am and 9 pm, a 10-hour time interval. The rate at which customers enter the restaurant is given by the piecewise equation (15-2? 10 4 0