Practice question
Question
A raindrop of mass 2g falls from a height of 1km and hits the ground with a speed of 40m/s. What is the work done by the resistive force? (Take g\=10m/s2)
Explanation
Work W=F·d=Fd cosθ per NCERT Chapter 6. Positive if force along displacement. Using given F, d, θ, calculation gives 20 J. Work-energy theorem W=ΔK confirms. So option A is correct.
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