The anount of extension in an elastic string varies directly as the weight hung on it. If a weight of 150 gm produces an extension of 2.9 cm, then what weight would produce an extension of 17.4 cm?
Let the weight required is 
gm
Extension (cm) | 2.9 |
|
Weight (gm) | 150 |
|
On cross multiplication, we get
Therefore weight is 900 gm
20