A particle starts from rest at the origin and moves eastward with a constant…

PHYSICS · Single correct · CBSE · Physics · Motion · Motion

Problem

A particle starts from rest at the origin and moves eastward with a constant acceleration of

3\,\text{m}\,\text{s}^{-2}

for

4\,\text{s}

. Immediately afterwards, its acceleration reverses direction but keeps the same magnitude for the next

4\,\text{s}

. East is maintained as the positive direction throughout. What is the particle’s velocity at

t=8\,\text{s}

? (a)

+24\,\text{m}\,\text{s}^{-1}

(b)

0\,\text{m}\,\text{s}^{-1}

(c)

+12\,\text{m}\,\text{s}^{-1}

(d)

-12\,\text{m}\,\text{s}^{-1}