Is the answer d? a skydiver is accelerating downwards as he falls. earth is pulling him down with a gravitational force of 600 n downward, while he pulls the earth upward with a force of 600 n. he also experiences an upward drag force of 100n what is the net force on the skydiver? 100 n, upward 500 n, upward 500 n downward 100 n, downward

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.