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//Find the least initial velocity
//refer fig. 13.10
//Let u the initial velocity required and alpha the angle of projection
//here
range=9 //m
//at P x=5m and y=4m
//u^2=(9*g)/(sind(2*alpha))
//from the equation of trajectory
alpha=atand(1.8) //degree
//thus
u=sqrt((9*9.81)/(sind(2*60.95))) //m/sec
printf("u=%.2f m/sec",u)
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