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March 13th, 2018, 03:08 AM   #1
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[ASK] Kicked Ball

In a soccer match Putu kicked the ball with the elevation angle $\displaystyle \alpha$ so that it reached the maximum height 10 m. How long must he wait until the ball fall to the ground if g = $\displaystyle 10m/s^2$?

I don't know how to do it if the initial velocity isn't known. Can someone help me?
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March 13th, 2018, 03:43 PM   #2
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Originally Posted by Monox D. I-Fly View Post
In a soccer match Putu kicked the ball with the elevation angle $\displaystyle \alpha$ so that it reached the maximum height 10 m. How long must he wait until the ball fall to the ground if g = $\displaystyle 10m/s^2$?
$\Delta y = v_y \cdot t - \dfrac{1}{2}gt^2$

at the max height, $v_y = 0$ ...

$-10 = 0 - 5t^2$

solve for $t$
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March 13th, 2018, 05:07 PM   #3
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$\displaystyle t=\sqrt2$?
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