Question

How can you calculate the weight of this ruler?

Answer 1

Answer:

Let x be the weight of the metre rule

( 2.4 N = 2.4*10 = 24 Kg)

From principle of moments,

Sum of clockwise moments = sum of anticlockwise moments

24*(20-5) = (100-20) * x

24*15= 80 *x

X = 4.5 Kg

Weight of the metre rule is 4.5 kg