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## anonymous 3 years ago A balloonist happens to drop his metal ballpoint pen from his balloon as he is taking notes on his flight. Because his pen has a streamlined shape, air resistance has little effect on its fall. The pen strikes the ground at 22 m/s. How high was the balloon? (Points : 6) 25 m 49 m 850 m 9,500 m

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1. anonymous

u have to find acceleration to find height

2. anonymous

the formula that can be used is v^2=u^2+2as

3. anonymous

wht is your answer

4. anonymous

$$\vec v_f^2=\vec v_i^2+2\vec a \cdot \vec S$$ since $$\vec v_i=0\hat j$$,$$\vec v_f=-22\hat j$$,$$\vec a=-10\hat j$$, plug it in to get, $$(-22\hat j)^2=2(-10\hat j) \cdot \vec S$$ $$\vec S=-24.2\hat j$$ do you need further help?

5. anonymous

@Shadowys u could've aloud @megen505 to solve this q' her own and understand. at least a chance

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