Q

A body of mass m moves with velocity V and kinetic energy K. If its velocity doubles, what is its new kinetic energy?

RRB ALP (Stage-II); RRB ALP & Technician; RRB ALP & Technician; RRB Group D 06/05/2025 / Shift-II; 20/08/2018 / Shift-III; 09/08/2018 / Shift-II; 24/09/2018 / Shift-II 2025; 2018
✓ Answer: D 4K
K ∝ v² for fixed mass. Doubling speed multiplies kinetic energy by four.
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