A drag racing car with a weight of 1600 lbf attains a speed of 270 mph in a quarter-mile race. Immediately after passing the tim
ing lights, the driver opens a drag chute. At this point, the air and rolling resistance of the car are negligible compared to the drag of the chute. What chute diameter (in feet) is required to make sure that the car decelerates to 60 mph within 7 seconds?
A force is exerted by the elevator to the suitcase, according to 3th Newton's law an equal force but in the opposite direction will appeared on the suitcase, that is: