Need this now !
the motion of an object involves both time and?

a: velocity
b: speed
c: distance
d: displacement

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.

Can anybody me with this? ? (picture included.)

Energy flows from the producer level to the level. is called