Please help, Very desperate and limited amount of time

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.

Ascientific blank must be testable and capable of being proven false?

70 give a real life example showing how sensory neurons work with the motor neurons