Two point masses are on the -axis: a mass at and a mass at

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

Problem

Two point masses are on the

x

-axis: a

3\,\text{kg}

mass at

x=0

and a

2\,\text{kg}

mass at

x=5\,\text{m}

. The

2\,\text{kg}

mass is then moved to

x=7\,\text{m}

while the

3\,\text{kg}

mass remains fixed. What is the new

x

-coordinate of the center of mass of the two-mass system? (a)

2.0\,\text{m}

(b)

3.5\,\text{m}

(c)

2.8\,\text{m}

(d)

4.2\,\text{m}