A tree trunk of diameter $20 c m$ lies in the horizontal field. A lazy grasshopper wants to jump over the trunk. Find the minimum takeoff speed of the grasshopper that will suffice. (No air drag)

1.1 m / s e c

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2.2 m / s e c

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3.3 m / s e c

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4.4 m / s e c

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Solution

The correct option is B $2.2 m / s e c$
$\begin{matrix} u = \sqrt{2 g r (1 + \sqrt{2})} = \sqrt{2 \times 10 \times 0.1 (1 + \sqrt{2})} = 2.2 m / s \end{matrix}$

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