When a car at rest, driver sees rain drops falling on it vertically when driving the car with speed V, he sees that rain drops are coming at an Angle 60⁰from the horizontal and on further increasing the speed of the car to (1+B)V the angle change to $45^{0}$ . The value of B is close to

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0.50

0.41

0.37

0.73

answer is D.

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Detailed Solution

$\tan 60^{0} = \frac{V_{r}}{V}$ and

$\begin{array}{l} \tan 45^{0} = \frac{V_{r}}{(1 + B) V} \end{array}$

$\Rightarrow B = \frac{V_{r}}{V} - 1 = \sqrt{3} - 1 = 0.732$

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