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A metal box, attached to a small parachute, is dropped from a helicopter. explain in terms of the forces acting; why:
(i) its velocity increased immediately after being dropped (ii) it reached a uniform velocity after a short time
(i) because there's gravity force pulling it downwards.
(ii) because the force on the metal box is gone (either it has landed on the ground or something else happened) that means that the metal box is no longer moving but it has constant velocity/uniform velocity.
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