A decorative light fixture in an elevator includes a 1.7 kg light suspended by a cable from the ceiling of the elevator. At the bottom of this light, a second cable suspends another 0.40 kg light. The elevator is moving downward at 3.6 m/s when someone presses the emergency stop button. During the stop, the upper cable snaps. The elevator engineer says that the cable could withstand a force of 40 N without breaking. How long does it take for the elevator to stop?

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: