# Homework Help: 2 objects with pully. need distance

1. Jun 30, 2010

### dwilson89

2 objects with pully. need distance!!!

1. The problem statement, all variables and given/known data
The two masses shown in the figure are each initially 1.80 above the ground, and the massless frictionless pulley is 4.8 above the ground.
What maximum height does the lighter object reach after the system is released? [Hint: First determine the acceleration of the lighter mass and then its velocity at the moment the heavier one hits the ground. This is its "launch" speed. Assume it doesn't hit the pulley.]

2. Relevant equations
I AM NOT SURE

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2. Jul 1, 2010

### ehild

Re: 2 objects with pully. need distance!!!

What do you think about the relevant equations? Can you apply Newton's second law to find the acceleration of the blocks?

ehild

3. Jul 1, 2010

### Bartek

Re: 2 objects with pully. need distance!!!

You have to calculate on what height and with wtat velocity M1 start "jump". Starting height is easy to calculate - M2 is on the floor at the moment...

To find the speed you can use Newton's law (as ehild suggest) or law of energy conservation (I think it is easiest).

Then you have to calculate height. One time more you can use Newton's law, or conservation of energy (I think it is easiest) .

regards

Last edited: Jul 1, 2010