By which velocity should a ball be projected upward from the top of a tower of height at an angle of 30°,with horizontal, so that it falls at a distance of 17.3m from the base of the tower where (g=10m/s^-2)
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let's throwing a part be 0
horizontal be X direction and vertical be z direction
initial be =(50cos30) I + (50sin30) j
a = -10
S = it +1/2 at2
S = (50*cos30*t)i + (50*sin30*t - 5*t)j
it will reach the ground when y coordinate of the ball is = -70
so (50*sin30*t2) =-70
t2-5t-14 =0
t -7 or t+2
t = 7
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