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Answer on Mechanics | Relativity Question for BALACHANDRA K

Question #1853
An projectile is fired uphill over ground with slope at an angle alpha to the horizontal.Find the direction in which it should be aimed to achieve the maximum range
Expert's answer
Let's denote the distance as S and write the equations of the motion under the gravitational acceleration:
H = h0 + voyt - gt2/2
S = vox t
Where vox = Vo cos(α), voy = Vo sin(α), ho = 0, H = 0.

0 = Vo sin(α)t - gt2/2; t =0; t = 2Vo sin(α) / g
S = Vo cos(α)t
S = 2Vo cos(α)Vo sin(α) / g = Vo sin (2α) / g , the maximum value of sin(2α) is 1 at 2α = 90, hence
α = 45 degrees.

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