Thursday, February 11, 2010

A ball is pitched at a 45 degree angle and travels a distance of 98 meters to clear a fence, what is inital v?

this is an extra credit problem for my physics class and i could really use the help please!A ball is pitched at a 45 degree angle and travels a distance of 98 meters to clear a fence, what is inital v?
for the sake of getting a numerical answer, we'll assume that the ball is pitched at the same height as the fence. Vx = x velocity, Vy, etc.


d = Vx * t


0 = Vy * t - 1/2 g t虏 = t(Vy - 1/2 g t) disregard zero root


t = 2 Vy / g


d = 2 Vx Vy /g


Vx = V cos(a)


Vy = V sin(a)


cos(45)*sin(45) = 1/2


d = V虏 /g


V = sqrt(dg)


plug and chug

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