Question

The second hand of a watch is 2 cm long. The speed of the tip of this hand is

Answer 1

The circular path of the tip of the watch is,
d = 2 × π × r
= 2 × 3.14 × 2
= 12.56 cm

The time in which the tip covers one revolution,
t = 60 s

So,

The speed of the tip is,
v = 12.56/60
= 0.21 cm/s