Are the objects described here in static equilibrium, dynamic equilibrium, or not in equilibrium at all?a. A girder is lifted at constant speed by a crane.b. A girder is lowered by a crane. It is slowing down.c. You’re straining to hold a 200 lb barbell over your head.d. A jet plane has reached its cruising speed and altitude.e. A rock is falling into the Grand Canyon.f. A box in the back of a truck doesn’t slide as the truck stops.

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!