Question

A raindrop falling from a height h above ground attains a near terminal velocity when it has fallen through a height $\left( \frac { 3 } { 4 } \right) \mathrm { h }$ . Which of the diagrams shown in figure correctly shows the change in kinetic and potential energy of the drop during its fall up to the ground?

• A.
• B.
• C.
• D.

Answer 1

Answer: (B)

Answer 2

At a height h above the ground, PE of raindrop is maximum and KE = 0. As the raindrop falls its PE goes $\frac { \mathrm { h } } { 4 }$ above the ground. At this stage, rain drop has acquired near terminal velocity (=constant). Therefore, at this stage, KE tends to be constant. PE becomes zero when raindrop falls to the ground. Hence, option (2) is most appropriate.