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Matter In Our Surroundings

Question
CBSEENSC9005676
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A particle moves from a point P directly towards another point Q which is at a distance of 10 cm from P. It then comes back to P directly. Calculate:

(i) the total distance travelled; and

(ii) the displacement of the particle.

Solution

Given, 
Distance between points P and Q = 10 cm

(i) Total distance travelled = PQ + QP
                                       = (10 + 10) cm
                                       = 20 cm. 

(ii) Displacement of the particle will be zero, because the particle comes back to the initial position. That is, the initial and final position is same. 

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