SOLUTION: A projectile is fired from the ground with an upward speed of 245 m/s. After how many seconds will it return to the ground? Use the formula h = vt - 4.9t^2.
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Question 318835: A projectile is fired from the ground with an upward speed of 245 m/s. After how many seconds will it return to the ground? Use the formula h = vt - 4.9t^2. Answer by nerdybill(7384) (Show Source):
You can put this solution on YOUR website! A projectile is fired from the ground with an upward speed of 245 m/s. After how many seconds will it return to the ground? Use the formula h = vt - 4.9t^2.
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From the problem:
v = 245 m/s
h = 0 (ground level is 0)
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h = vt - 4.9t^2
0 = 245t - 4.9t^2
0 = t(245 - 4.9t)
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Solving for t:
245 - 4.9t = 0
-4.9t = -245
t = -245/-4.9
t = 50 seconds
