A car is moving at when a constant forward driving force of begins to act

PHYSICS · Single correct · CBSE · Physics · Work, Energy and Power · Work, Energy and Power

Problem

A 1.2×103 kg1.2\times10^{3}\,\text{kg} car is moving at 10 m/s10\,\text{m/s} when a constant forward driving force of 2.4×103 N2.4\times10^{3}\,\text{N} begins to act. Neglect all frictional forces. At what time after the force begins acting is the instantaneous power delivered by the force double its value at the instant the force was applied? (a) 2.1 s2.1\,\text{s} (b) 5.0 s5.0\,\text{s} (c) 10 s10\,\text{s} (d) 2.5 s2.5\,\text{s}

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