Question
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.