Suppose that an automobile's velocity starting from rest is v(t) = lecimal place. O 3.3 ft/sec2 O 2.6 ft/sec² O 0.9 ft/sec² O 0.7 ft/sec² O 13.1 ft/sec² Question 9 280t 5t+15 where v is measured in feet per second. Find the acceleration at 5 seconds. Round your answe Find the open interval(s) on which f(x) = -5x² +50x+8 is increasing or decreasing.

ourse: MAC 2311 (SP22, DL) 7. You and a companion are driving a twisty stretch of road in a car with a speedometer but no odometer. To find out how long this road is, you record the car's velocity at 10-second intervals. Time (s) Velocity (ft/s) Time (s) Velocity (ft/s) 70 11 10 32 80 23 20 36 90 32 30 26 100 22 40 47 110 10 50 49. 120 29 60 19 a. Estimate the length of the road using left-endpoint values. 3660 ft b. Estimate the length of the road using right-endpoint values. ft 000 esc F4 F5 F6 10 F11 12 F1 F2 F3 #3 $ % & * 1 2 3 4 6 7 8 delete { Q W E R Y U tab A S D G H J K L return caps lock > V IB N .. .-

A skydiver weighing 292 lbf (including equipment) falls vertically downward from an altitude of 4000 ft and opens the parachute after 10s of free fall. Assume that the force of air resistance, which is directed opposite to the velocity, is 0.77 |v| when the parachute is closed and 10|v| when the parachute is open, where the velocity v is measured in ft/s. Use g = 32 ft/s². Round your answers to two decimal places. (a) Find the speed of the skydiver when the parachute opens. v(10) = i (b) Find the distance fallen before the parachute opens. x(10) = i VL (c) What is the limiting velocity v after the parachute opens? = ft/s i ft ft/s