A force acting along the -axis on a body varies with position according to (in newtons)

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A force acting along the

x

-axis on a

2\,\text{kg}

body varies with position according to

F(x)=2+Bx

(in newtons), where

B

is a constant and

x

is in metres. Starting from rest at

x=0

, the body attains a speed of

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

after moving

5\,\text{m}

on a frictionless surface. The value of

B

is (a)

0.60\,\text{N m}^{-1}

(b)

1.2\,\text{N m}^{-1}

(c)

2.0\,\text{N m}^{-1}

(d)

0.48\,\text{N m}^{-1}