Answer :

felixkings

Answer:

[tex] \beta \: = 3.94 \: - t \: (i.e \: \sqrt{ \frac{249}{16} } - t ) \: = 7t[/tex]

since

[tex]3.94 \: - t \: = 7t \\ \: then \: t \: = \: 0.49s[/tex]

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