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anonymous
 one year ago
A volleyball is thrown up in the air with initial velocity of 8.2m/s.
what is the maximum height reached?
anonymous
 one year ago
A volleyball is thrown up in the air with initial velocity of 8.2m/s. what is the maximum height reached?

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zephyr141
 one year ago
Best ResponseYou've already chosen the best response.1use the kinematic equations. looks like it's the same ball with the same initial velocity. so that means we can use the time we found in the last question to find the maximum height achieved. now remember that at it's highest point the final velocity in the y direction will be 0 so knowing that let's look at the kinematic equations again and pick the best equation that best fits this problem.

zephyr141
 one year ago
Best ResponseYou've already chosen the best response.1matter in fact we can use this one\[d=v_0t+\frac{1}{2}at^2\]

zephyr141
 one year ago
Best ResponseYou've already chosen the best response.1i think the time we found was 0.84 seconds.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0well my teacher said not to use the same time for this cause it'll give me the wrong answer

zephyr141
 one year ago
Best ResponseYou've already chosen the best response.1are you sure? because the time isn't going to change if you solve for time for this equation. i just checked and the velocities are the same in both questions and since gravity isn't changing it has to be the same time.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i didnt understand her reasoning but i think thats whats throwing me off.

zephyr141
 one year ago
Best ResponseYou've already chosen the best response.1ok lets leave time out then. use this equation. it doesn't need time.\[v^2=v_0^2+2ad\]

zephyr141
 one year ago
Best ResponseYou've already chosen the best response.1isolate d in the equation first.

zephyr141
 one year ago
Best ResponseYou've already chosen the best response.1you should get \[d=\frac{v^2v_0^2}{2a}\]and now just plug in your known values. v0=8.2 m/s v=0 a=9.8

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0okay. so i got 8.2/ 19.6??

zephyr141
 one year ago
Best ResponseYou've already chosen the best response.1\[d=\frac{0(8.2)^2}{19.6}=\frac{67.24}{19.6}=3.4306m\] or 3.4 meters. which is the same if we used time. so i don't really know why your teacher told you not to use time. maybe to solve it using a different equation.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oh man i didnt square them. yah probably idk ill ask her about it, thanks! again lol
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