Suppose that a ball is rolling down a ramp. The distance traveled by the ball is given by the function s left parenthesis t right parenthesis equals 5 t squared, where t is the time, in seconds, after the ball is released, and s(t) is measured in feet. Find the ball's average velocity in each of the following time intervals. Question content area bottom Part 1 a. t 1 equals 4 to t 2 equals 5 StartFraction Upper Delta s Over Upper Delta t EndFraction equals 45 ft divided by sec Part 2 b. t 1 equals 4 to t 2 equals 4.5 StartFraction Upper Delta s Over Upper Delta t EndFraction equals nothing ft divided by sec