MHT CET 2022 Mathematics question
A stone is dropped in a quite lake and it is observed that waves move in circles. If the radius of a circular wave increases at the rate 2 cm/sec, then the rate of increase in its area at the instant when its radius is 10 cm, is cm/sec
Answer: (A)
Solution
Area . Differentiating with respect to time, . With cm and cm/s: cm/s. Hence
See the full step-by-step solution
Create a free account to read the complete working, and practise questions like this in a timed test.
Create a free account