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

Question

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

anonymous · Answer

u have to find acceleration to find height

anonymous · Answer

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

anonymous · Answer

wht is your answer

anonymous · Answer

$\vec v_f^2=\vec v_i^2+2\vec a \cdot \vec S$
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?

anonymous · Answer

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