A body starts moving with velocity

PHYSICS · Single correct · ISC · Physics · Kinematics · Kinematics

Problem

A body starts moving with velocity v0=10 m s−1v_0=10\,\mathrm{m\,s^{-1}}. It experiences a retardation equal to 0.2v20.2v^2. Its velocity after 2 s2\,\mathrm{s} is (1) +2 m s−1+2\,\mathrm{m\,s^{-1}} (2) +4 m s−1+4\,\mathrm{m\,s^{-1}} (3) −2 m s−1-2\,\mathrm{m\,s^{-1}} (4) +6 m s−1+6\,\mathrm{m\,s^{-1}}

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