JEE Main 2026 Physics question
The rain drop of mass 1 g, starts with zero velocity from a height of 1 km. It hits the ground with a speed of 5 m/s. The work done by the unknown resistive force is J. (take g=10 m/s²)
Answer: (D)
Solution
Work–energy theorem: mgh+W=½mv². 0.001×10×1000+W=½(0.001)(25)=0.0125, so W=0.0125−10≈−9.99 J; the closest listed value is −9.98 J.