plase help with the last part (d) a,b and c are correct Consider a 79.0-kg man s

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plase help with the last part (d) a,b and c are correct

Consider a 79.0-kg man standing on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.82 m/s in 0.750 s. It travels with this constant speed for the next 5.00 s. The elevator then undergoes a uniform acceleration in the negative y direction for 1.20 s and comes to rest.

(a) What does the spring scale register before the elevator starts to move? 774.72535 N

. (b) What does the spring scale register during the first 0.750 s? 965.9 N

(c) What does the spring scale register while the elevator is traveling at constant speed? 774.72535 N

(d) What does the spring scale register during the time it is slowing down?

Explanation / Answer

d)

the acceleration,

a = v/t = 1.82/1.2

So,

a = 1.52 m/s2

Now, the acceleration is downwards. So, the pseudo acceleration is upwards

So, the weight of the man,

W = mg - ma

= m*(g-a)

= 79*(9.8-1.52)

So,

W = 654.1 N

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