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Q.

A small block slides with velocity $0.5 \sqrt{g r}$ on the horizontal frictionless surface as shown in fig The block leave the surface at point C. The angle $θ$ in the fig is

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a

${sin}^{-1} (\frac{\sqrt{7}}{4})$

b

${cos}^{-1} (3/4)$

c

${cos}^{-1} (1/2)$

d

None of these

answer is A.

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Detailed Solution

$\cos θ = [\frac{V_{0}^{2}}{3 r g} + \frac{2}{3}]$

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