a meter rule is found to balance the 48cm mark when a body of 60g is suspended at the 6cm mark the balance point shift to the 30cm mark . what is the mass of the meter rule? ?

Let the mass of the meter rule be M grams.

According to the principle of moments, the total anticlockwise moment about the pivot point must be equal to the total clockwise moment about the pivot point.

At the 48cm mark:
60g * 6cm = M * 48cm

At the 30cm mark:
60g * 24cm = M * 30cm

Solving these two equations simultaneously:
360 = 48M
1440 = 30M

M = 7.5g

Therefore, the mass of the meter rule is 7.5 grams.

It should be 80g