A 73-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 0.89 s. The elevator travels with this constant speed for 5.0 s, undergoes a uniform negative acceleration for 1.7 s, and then comes to rest. (a) What does the spring scale register before the elevator starts to move? (b) What does the spring scale register during the first 0.89 s of the elevator's ascent? N (c) What does the spring scale register while the elevator is traveling at constant speed? (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: