Two particle of mass `2 kg and 1 kg` are moving along the same straight line with speeds `2m//s and 5m//s` respectively. What is the speed of the centre of mass of the system if both the particles are moving (a) in same direction (b) in opposite direction ?

Explanation

Here, `m_(1) = 2kg, m_(2) = 1 kg`
(a) `v_(1) = 2 m//s, v_(2) = 5m//s, v_(cm) = ?`
(b) `v_(1) = 2m//s, v_(2) =- 5m//s, v_(cm) = ?`
Use `oversetrarr(v_(cm)) = (m_(1) oversetrarr(v_(1)) + m_(2) oversetrarr(v_(2)))/(m_(1) + m_(2))`