A block starts from rest at the origin and is acted on by a force that varies with…

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

Problem

2.0\,\text{kg}

block starts from rest at the origin and is acted on by a force that varies with position according to

F(x)=4x\,\text{N}

, where

x

is the displacement in meters along a straight line. What is the block’s speed when it reaches

x=3.0\,\text{m}

? (a)

6.0\,\text{m/s}

(b)

4.2\,\text{m/s}

(c)

3.1\,\text{m/s}

(d)

8.5\,\text{m/s}