8.1ms-1
10.0ms-1
10.6ms-1
22.5ms-1
Correct answer is C
n = \(\frac{\sin 45}{\sin 30} = 1.4142\)
n = \(\frac{15m/s}{x}\)
x = \(\frac{15}{1.4142}\) = 10.6m/s
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