Water is dropped at the rate of 2cm³/sec into a cone of

Last updated: 7/19/2022

Water is dropped at the rate of 2cm³/sec into a cone of semivertical angle 45°. The rate at which periphery of water surface changes when height of the water in the cone is 2 cm, is :- 1 cm/sec 2 cm/sec 3 cm/sec 4 cm/sec