Question

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Answer 1

Answer:

option b

Explanation:

Since, the elevator was initially at rest position hence the initial velocity of elevator must be zero. So, on applying Newton's second law equation we will get that S= it+1/2at^2.S=1/2at^2 where a is the acceleration given 0.6 m/s^2.The time to given as 10 seconds. So, S=1/2*0.6*10*10=30 m

Now, the pulley having a radius r or 0.4 meter. So, the number of rotations will be 2πr=2.5m.So,to cover 30meter,the number of turns required will be 30/2.5 which is 12 turns

12 is close to 11.94,so the answer will be option(b)

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Answer 2

Answer:

Option. B

11.94 is the no. of rotations