The diagram above illustrates a uniform metre rule which is balanced on a pivot by some masses. Calculate the value of M

A. 500.0g
B. 400.0g
C. 44.4g
D. 25.0g

Correct Answer: Option D

D. 25.0g

Explanation

clockwise moment = Anti-clock wise moment

= M x 40 = 100 x 10

M = 1000/40

= 25g