A particle moves along the -axis under a variable force

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

Problem

1\,\text{kg}

particle moves along the

x

-axis under a variable force

F(x) = 2x\,\text{N}

, where

x

is in metres. If its speed at

x = 0

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

, what is its speed when it reaches

x = 3\,\text{m}

? (a)

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

(b)

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

(c)

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

(d)

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