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I-Love-Maths2

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A catapult is pulled back 10cm with a force of 30N. How fast does the stone of mass 0.5kg got at maximum speed assuming no air resistance.

I have absolutely no idea how to do this...

But, I am assuming you use Ek=1/2mv^2, though I can't figure out how to apply it

To rearrange that:

V=sqrt[Ek/(1/2m)]

So, to make it clearer

- 10cm would be the displacement (s)

- 30N would be the force (F)

- 0.5kg would be the mass (m)

- 9.8m/s is the given unit for gravity in GCSE (g)

Other equations that might be useful:

- WD=Fs so WD=300J

- Ep=mgh

- W=mg

So from that we need an equation that uses WD and m

Can anybody help?

I have absolutely no idea how to do this...

But, I am assuming you use Ek=1/2mv^2, though I can't figure out how to apply it

To rearrange that:

V=sqrt[Ek/(1/2m)]

So, to make it clearer

- 10cm would be the displacement (s)

- 30N would be the force (F)

- 0.5kg would be the mass (m)

- 9.8m/s is the given unit for gravity in GCSE (g)

Other equations that might be useful:

- WD=Fs so WD=300J

- Ep=mgh

- W=mg

So from that we need an equation that uses WD and m

Can anybody help?

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