Question

An insect moves for 20 minutes along the
circumference of a circular clock of
diameter 20cm. Displacement and distance
of the insect are
20
cms,
2017
-cms
15
1) TE
2) J2
2011
cms,
cms
3
زر
20
121
cms,
CMS
15 107
cms, cms
3)
4) J3
Vz
4
4​

Answer 1

Given:

• Time taken of the insect to travell the circular clock = 20min
• Diameter of circular = 20cm

To find:

• Displacement & distance

Solution:

Here ,

Distance = Circumference of clock

Because , the insect travells around the clock.

Displacement = diameter

Because , let us assume the starting point of insect be A & the final point where the insect ends be B . Here, the insect travells 1 round so , joing the initial point to final point (A-B) because , displacement : shortest distance from initial point to final point .

Now ,

Distance = circumference

Circumference = πd

d is diameter

Circumference = 22/7 × 20

Distance = 62.85

Displacement = diameter = 20cm