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Easy question... - HSN forum

# Easy question...

3 replies to this topic

### #1Floorball Maniac

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Posted 15 September 2005 - 07:24 PM

This questions looks simple and I think I know how to do it. The only problem is I cant get the right answer. It's from Scholar. There could be a chance the answer is wrong. The question uses higher knowledge only.

A piano is being raised to the third floor of a building using a rope and pulley. The piano is m above the ground, moving upwards at m s -1 , when the rope snaps.
Calculate how much time (in s) elapses before the piano hits the ground.

Can someone do the question and see what they get.

### #2dfx

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Posted 15 September 2005 - 08:31 PM

I think you left out the values...

### #3Floorball Maniac

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Posted 18 September 2005 - 02:14 PM

Obviously cant copy and paste from Scholar then. Never mind.

### #4werlop

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Posted 18 September 2005 - 05:36 PM

If you give me the values I can help.

You basically need to use as you know the initial velocity in the upwards (positive) direction, the acceleration due to gravity ( ), and the vertical displacement (s). The piano will continue upwards for a short period of time because of the acceleration due to gravity, and then accelerate downwards. ie there is a constant negative acceleration.

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