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R=20√3m , x=15√3m, H =5m
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x=ucos¢t=20√3/2×1.5
=15√3m
y=u sin¢t-1/2gt^2
y=20×1/2×1.5-1/2×10×1.5×1.5
y=15/4
y=3.75m
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