A man steps out of a plane at a height of 4000 m above the ground, falls
2000 m very quickly, and then opens his parachute and slowly falls the
remaining 2000 m to the ground. What height above the ground would be the
best choice for a reference point?
O A. 6000 m
OB. 4000 m
C. Om
OD. 2000 m
