(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

motor is mounted on top of lift.

a)if p moves by y, what is the displacement of Pt A? Prove that V_{p}=-3V_{a}.

b)If motor unwidns cable at const rate 2m/s, what is vel of cable wrt lift.

Prove vel of lift is 0.5m/s

2. Relevant equations

3. The attempt at a solution

I can do part a. I have prob with part b. If motor releases cable at 2m/s, can i take it that pt p moves 2m/s. so V_{a}is 2/-3=-0.667. Since pt a is connected to the lift, the vel of cable wrt lift is 2+0.667=2.667.

But velocity of lift is 0.5 so the vel of cable wrt to lift is 2.5. This is getting confusing.

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# Homework Help: Lift relative velocity problem.

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