56. A rod of length is 3m and its mass acting per unit length is directly proportional to distance 
from one of its end then its centre of gravity from that end will be at
A
1.5 
B
2 
C
2.5 
D
3.0 
.
.
Text Solution
Verified by ExpertsThe correct answer is:
B
Let us consider an elementary length dx at a distance x from one end. It’s mass = 
[k = proportionality constant] Then centre of gravity of the rod 
is given by
or, 
Centre of gravity of the rod will be at distance of 2 
from one end.
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