A system consisting of two masses connected by a massless rod lies along the x axis. If 0.2 kg mass is at a distance x = 0.5 m while a 0.3 kg mass is at a distance x = 1m, then the x-co-ordinate of the centre of mass will be at

Options

A. 2.5 m
B. 5m
C. 22.5 m
D. 0.8 m

Answer

d

Explanation

`x = (m_(1)r_(1)+m_(2)r_(2))/(m_(1)+m_(2)) = ((0.2 xx 0.5) + (0.3 xx 1))/(0.5) = 0.8`