Question

point masses 2g, 5g and 1g are situated at the points with position vectors 3i - 4j, -i +5j and 5i - j, respectively. Find the position vector of the centre of mass for these three particles.

Answer 1

\[center of mass = \frac{\sum_{i}^{}w_{i} p_{i}}{\sum_{i}^{} w_{i}}\]where w are the masses and p are their positions.