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A stone is dropped into a pand. Waves in the form of circles are generated and the radius of the

A stone is dropped into a pand. Waves in the form of circles are generated and the radius of the A stone is dropped into a pand. Waves in the form of circles are generated and the radius of the outermost ripple increases at the rate of 2 inch/sec. How fast will the area of the wave increase ? (a) when the radius is 5 inch? (b) after 5 seconds ?

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