A 85-kg man stands on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.2 m/s in 0.72 s. The elevator travels with this constant speed for 5.0 s, undergoes a uniform negative acceleration for 1.6 s, and then comes to rest. (a) What does the spring scale register before the elevator starts to move?  N (b) What does the spring scale register during the first 0.72 s of the elevator's ascent?  N (c) What does the spring scale register while the elevator is traveling at constant speed?  N (d) What does the spring scale register during the elevator's negative acceleration?  N

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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: