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A spherical soap bubble is expanding so ...

A spherical soap bubble is expanding so that its radius is increasing at the rate of 0.02 cm/sec. At what rate is the surface area is increasing, when its radius is 5cm?

A

vertically upwards called normal reaction.

B

vertically downwared called normal reaction.

C

tangential force acting along the motion .

D

tangential force acting opposite to the motion.

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The correct Answer is:
A
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