FOUR PEOPLE WITH A COMBINED MASS OF 300 KG ARE RIDING IN A 1100 KG CAR. WHEN THEY DRIVE DOWN A WASHBOARD ROAD WITH BUMPS SPACED 5.0M APART, THEY NOTICE THAT THE CAR BOUNCES UP AND DOWN WITH A MAXIMUM AMPLITUDE WHEN THE CAR IS TRAVELING AT 6.0 M/S. THE DRIVER STOPS THE CAR AND EVERYONE EXITS THE VEHICLE. HOW MUCH DOES THE CAR RISE UP ON ITS SPRINGS?