A-LevelPhysicsWork, energy and power9702/12 · Oct/Nov 2010 · Q151 Mark
A raindrop of mass m is falling vertically through the air with a steady speed v. The raindrop experiences a retarding force kv due to the air, where k is a constant. The acceleration of free fall is g. Which expression gives the kinetic energy of the raindrop?
Amg / k
Bmg² / (2k²)
Cm³g² / k²
Dm³g² / (2k²)
✓ Correct answer
D: m³g² / (2k²)
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