Step 1:

Circular ripple travels outward with a speed of 60 cm/sec.

(a)

Consider time taken by the circular ripple to travel a distance $\"\"$ is $\"\"$ .

Speed-distance relation:

$\"\"$

The distance travelled by the circular ripple is

$\"\"$

(b)

Find $\"\"$ .

Area of circle is $\"\"$ .

$\"\"$

Area of circular ripple is $\"\"$ sq-cm.

Solution:

(a) The distance travelled by the circular ripple is $\"\"$ .

(b) Area of circular ripple is $\"\"$ sq-cm