An object of mass moves east with a non-zero velocity

PHYSICS · Single correct · CBSE · Physics · Laws of Motion · Laws of Motion

Problem

An object of mass

m

moves east with a non-zero velocity. At

t=0

, three horizontal forces begin acting on the object simultaneously: •

\vec F_1 = 4\,\text{N}

east (constant in time) •

\vec F_2 = 6\,\text{N}

west (constant in time) •

\vec F_3

has constant magnitude

3\,\text{N}

and is directed due north for

0\le t<2\,\text{s}

, after which its direction instantaneously changes to due south while its magnitude remains

3\,\text{N}

. Which of the following best describes the direction of the object’s acceleration during the time interval

2\,\text{s}<t<4\,\text{s}

? (a)

34^{\circ}

south of west (b) Due west (c)

56^{\circ}

south of west (d)

56^{\circ}

north of west