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# Springs (Physics) Question watch

A pop-up toy consists of a head and sucker of combined mass m=1.5kgm=1.5kg stuck to the top of a light spring of natural length l0=0.30m and spring constant k=250Nm^−1. The centre of mass of the system can be taken to be at the top of the spring. The spring is compressed to length l1=0.10m when the pop-up is stuck to the ground.

What height above the ground does the bottom of the unstretched spring jump to when it is smoothly released?
2. Hey, I'm stuck on the very same question! Figure it out yet? I'm guessing you are also doing the prep work for the Cambridge physics experience day
3. (Original post by DropTheOH-)
Hey, I'm stuck on the very same question! Figure it out yet? I'm guessing you are also doing the prep work for the Cambridge physics experience day
Yes I am! No, I'm just going to leave it now and hope it doesn't matter that i've not finished all the questions.
4. have you tried conservation of energy?

seems you'd be able to calculate the PE stored in the compressed spring and equate it with the GPE of the toy at maximum altitude with the information provided.
5. (Original post by LauraLovesOtters)
Yes I am! No, I'm just going to leave it now and hope it doesn't matter that i've not finished all the questions.
Me too yeah same here, I might have another look tomorrow, hope you enjoy your day! X
6. (Original post by Joinedup)
have you tried conservation of energy?

seems you'd be able to calculate the PE stored in the compressed spring and equate it with the GPE of the toy at maximum altitude with the information provided.
I've not covered this topic yet so I'm not sure how to do that
7. (Original post by DropTheOH-)
Me too yeah same here, I might have another look tomorrow, hope you enjoy your day! X
You too!
8. (Original post by LauraLovesOtters)
I've not covered this topic yet so I'm not sure how to do that
really?

PE in a spring is 1/2 kx2 k is the spring constant
GPE is mgΔh

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Updated: February 25, 2016
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