1 Suppose that the height of a skydiver t seconds after jumping from an airplane is given by s t 4500 20t 16t2 feet neglecting air resistance The skydiver pulls the ripcord after 10 seconds of free fall to deploy the parachute after he has fallen Write a velocity function for the skydiver t How fast is the skydiver falling the instant before he pulls the ripcord ft sec miles per hour Calculate the skydiver s average velocity over the time interval from 5 seconds to 10 seconds What is the skydiver s acceleration function 2 A car moves along the x axis so that at any time t t 0 the position is given by s t 4t 18t 15t 1 Write a velocity function for the car Write an acceleration function for the car What is the velocity of the car at t 2 What is the velocity of the car at t 4 What is the average velocity of the car on the time interval from 4 to 6 When is the car at rest circle