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A ball is to be shot from level ground t...

A ball is to be shot from level ground toward a wall at distance x. Figure 4-36b shows the y component `v_(y)` of the ball's velocity just as it would reach the wall, as a function of that distance x. The scaling is set by `v_(ys)=5.0m//sandx_(s)=20m`. What is the launch angle?

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`14.3^(@)~~14^(@)`
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