Accelerating elevator and force tension physics question!?

Posted on 2015-09-23 06:30:00 in Physics by JROSE

An elevator is accelerating upward at a rate of 3.0 m/s2. A block of mass 28 kg hangs by a low-mass rope from the ceiling, and another block of mass 81 kg hangs by a low-mass rope from the upper block.
(a) What are the tensions in the upper and lower ropes?

upper rope
___N

lower rope
___N

(b) What are the tensions in the upper and lower ropes when the elevator accelerates downward at a rate of 3.0 m/s2?

upper rope
___N

lower rope
___N

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