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Heather hits a tennis ball upward with an initial speed of 32 feet per second. After how many seconds does the ball hit the ground? Use the formula h = rt − 16t^2 where h represents height in feet and r represents the initial speed.
 one year ago
 one year ago
Heather hits a tennis ball upward with an initial speed of 32 feet per second. After how many seconds does the ball hit the ground? Use the formula h = rt − 16t^2 where h represents height in feet and r represents the initial speed.
 one year ago
 one year ago

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acrossBest ResponseYou've already chosen the best response.1
You have all you need to solve this problem. Where are you stuck?
 one year ago

acrossBest ResponseYou've already chosen the best response.1
Basically, you want to find a solution to the equation\[0=32t16t^2,\]where \(t\neq0\).
 one year ago

2leBest ResponseYou've already chosen the best response.0
You should also note that \[h=h_0 + v_0t+\frac{1}{2}gt^2\] where h is your height, h_0 is your initial height when you threw the ball, v_0 is your initial velocity, and g is the force of gravity (at 32ft/sec^2) You may run into this equation again in physics and this is the equation that is used there.
 one year ago

acrossBest ResponseYou've already chosen the best response.1
You could also derive it from an ordinary differential equation if you feel like it...
 one year ago
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