A bird is flying on a straight level course at constant velocity of 150 km per hour at a height of 200 meters above the ground. A sling shot located on the ground fires a small stone with an initial velocity of 200m/s, at the instant when the plane is vertically above it. The inclination to which the sling should be shot with respect to the horizontal is degrees.

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Highway Drainage

Highway drainage is the process of extracting and regulating the excess surface water on the pavement by giving the desired slope. The construction of a highway drain helps to divert the water present on the surface, and sub-grade by the means of slope. Highway drainage systems are a necessary part of smooth functioning of traffic, since the highway drainage systems provide proper disposal of unwanted substances from the highways.