The bob of a pendulum was released from a horizontal position. The length of the pendulum is 10 m. If it dissi…

Question

The bob of a pendulum was released from a horizontal position. The length of the pendulum is $10 \, \text{m}$ . If it dissipates $10\%$ of its initial energy against air resistance, the speed with which the bob arrives at the lowest point is:

A
$6\sqrt{5} \, \text{m/s}$
B
$5\sqrt{6} \, \text{m/s}$
C
$5\sqrt{5} \, \text{m/s}$
D
$2\sqrt{5} \, \text{m/s}$

Accepted Answer

A. $$6\sqrt{5} \, 	ext{m/s}$$

Answer

B. $$5\sqrt{6} \, 	ext{m/s}$$

Answer

C. $$5\sqrt{5} \, 	ext{m/s}$$

Answer

D. $$2\sqrt{5} \, 	ext{m/s}$$

Answer & step-by-step solution

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