SOLUTION: A projectile is fired from the ground with an upward speed of 245m/s. After how many seconds will it return to the ground? h= vt- 4.9t^2

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Question 333723: A projectile is fired from the ground with an upward speed of 245m/s. After how many seconds will it return to the ground? h= vt- 4.9t^2
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Hint: In this case, v=245 which means that the equation is h=245t-4.9t%5E2. From here, plug in h=0 to get 0=245t-4.9t%5E2 and then use then solve for 't'.