Gravitational force law and Skills for applying Newton’s second law for one-dimensional processes
Spider-Man Spider-Man holds the bottom of an elevator with one hand. With his other hand, he holds a spider cord attached to a 50-kg box of explosives at the bottom of the cord. Determine the force that the cord exerts on the box if (a) the elevator is at rest; (b) the elevator accelerates up at 2.0 m/s2; (c) the upward-moving elevator’s speed decreases at a rate of 2.0 m/s2; and (d) the elevator falls freely.
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