The displacement of a particle varies with time according to

PHYSICS · Single correct · CBSE · Physics · Motion in a Straight Line · Motion in a Straight Line

Problem

x = 3t + 2t^{2}

, where

x

is in metres and

t

in seconds. The acceleration of the particle at

t = 4

s is (a)

8 \text{ m s}^{-2}

(b)

4 \text{ m s}^{-2}

(c)

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

(d)

16 \text{ m s}^{-2}