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Question: A uniform metre scale balances at the 40 cm mark when weights of 10 g and 20 g are suspended from th...

A uniform metre scale balances at the 40 cm mark when weights of 10 g and 20 g are suspended from the 10 cm and 20 cm marks. The weight of the metre scale is –

A

50 g

B

60 g

C

70 g

D

80 g

Answer

70 g

Explanation

Solution

lw = acw

Mg × 10 = 10 g × 30 + 20 g × 20

M = 70 gm.