A body of mass 120g placed at the 10cm mark on a uniform metre rule makes the rule settle horizontally on a fulcrum places at 35cm mark. Calculate the mass of the rule
-
A.
60g -
B.
80g -
C.
120g -
D.
200g
Correct Answer: Option D
Explanation
m = (frac{25 times 120}{15})
= 200g