Q. 10

$c \, \alpha \, w^2 w = 40 when c = 24 24 = k \times 40^2 k = \frac{24}{40^2} k = \frac{24}{1600} k = \frac{3}{200}$

Find c when w = 60cm

$c = \frac{3}{200} \times 60^2 c = \frac{3}{200} \times 3600 c = \frac{3}{1} \times 18 c = 54$