Question 68

A spherical ball of diameter 35 cm rolls 20 times. How much is the distance (in m) covered by it?(Take $$\pi = \frac{22}{7}$$)

Solution

A spherical ball of diameter 35 cm.

the radius of spherical ball = r = $$\frac{35}{2}$$ cm

distance covered by spherical ball in one roll = $$2\pi\ r$$

= $$2\times\frac{22}{7}\times\ \frac{35}{2}\ $$
= $$22\times5\ $$

= 110 cm

distance covered by spherical ball in 20 roll = $$110\times20$$

= 2200 cm

= 22 m (1 m = 100 cm)

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