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Miquel: Calculating jump height? Someone help, if a basketball defender jumps for a rebound with a vertical velocity of 3.18 m/s, what was their jump height? I have this equation H= g*t2/8. How can I calculate it without time? Can someone explain the formula in words not in symbols please, it's been awhile since i've done physics. Thanks!
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  • September 7, 2015 at 4:59pm
  • Little Sky:For this question, I don't know where your equation is from but I know for sure u need to substitute your time with another equation that fits into this scenario. Basically, you have your initial velocity as 3.18m/s and your final velocity 0m/s at the highest point, let displacement be 's'. Acceleration due to gravity, -9.81m/(s^2), with minus sign because the direction is falling towards the ground. You have 2 formulas to suit this scenario when the acceleration is constant. 1) s = (v + u)*t/2, from the speed time graph, where area under graph is your displacement, s. 2) v = u + at, from definition of acceleration. Subtituting equation (1) into (2), you get:[deqn]v^2 = u^2 + 2as[/deqn]Substitute the parameters in to get rid of t and get your answer.
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    • September 8, 2015 at 1:59am
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