1.

A stone is dropped into a quiet pond and waves move in circles outward from the place where it strikes, at a speed of 30 cm per second. At the instant when the radius of the wave ring is 50 m, the rate of increases in the area of the wave ring is

Answer»

`0.75pi` sq.cm/sec
30 sq.cm/sec
`30PI` sq.m/sec
`0.4 PI` sq.cm/sec

Answer :C


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