Practice question
Question
A 3kg object is dropped from 17m. What is its speed just before hitting the ground? (Take g\=10m/s2)
Explanation
Potential energy V=mgh=3×10×17=510J. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 18 m/s. This satisfies dimensional consistency and physical conditions given, so option A is scientifically correct.