A baseball coach uses a radar device to measure the speed of an approaching pitched baseball. This device sends out electromagnetic waves with frequency${\mathit{f}}_{\mathbf{0}}$ and then measures the shift in frequency$\mathbf{∆}\mathit{f}$ of the waves reflected from the moving baseball. If the fractional frequency shift produced by a baseball is$\mathbf{∆}\mathit{f}\mathbf{/}{\mathit{f}}_{\mathbf{0}}\mathbf{=}\mathbf{2}\mathbf{.}\mathbf{86}\mathbf{\times }{\mathbf{10}}^{\mathbf{-}\mathbf{7}}$ what is the baseball’s speed in km/h ?

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