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a piece of marble is projected from earths surface with velocity 50 m/s.2s later it just clear a wall 5 m high .what is the angle of projection?
5=100SIN(X)-0.5 *10*0.25 SIN(X)=0.2
s=ut-1/2Gt2
Let angle be X
5=50sinx(2)-1/2(10)(4)
1/4=sinx
x=sin inverse (1/4)
why 0.25 taken?
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