A projectile is fired uphill over ground with slope at an angle α to the horizontal, Find the direction in which it should be aimed to achieve the maximum range.
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Expert's answer
2012-03-06T11:21:03-0500
A projectile is fired uphill over ground with slope at an angle α to the horizontal. Find the direction in which it should be aimed to achieve the maximum range.
Let's denote the distance as S and write the equations of the motion under the gravitational acceleration: H = h0 + Vy*t - gt2/2 S = Vx*t. Here Vx = V0*cos(α), Vy = V0*sin(α), h0 = 0, H = 0.
0& =& Vo sin(α)t - gt²/2; & t =0;& t = 2V0*sin(α)/g S = V0*cos(α)t & S& = 2V0*cos(α)V0*sin(α)/g = V0*sin(2α)/ g , the maximum value of& sin(2α) is 1 at 2α = 90, hence α = 45 degrees.
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