Question

Q3. A body moves 10 m from A to B and returns back from B to A. Total distance and total displacement in this case respectively are *

(a) 20 m , 20 m

(b) 0 m , 0 m

(c) 0 m , 20 m

(d) 20 m , 0 m​

Answer 1

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we know that..

distance = actual length coverd by an object

displacement = minimum length covered by an object

first journey : body moves A to B

distance = AB = 10m ( actual length of covered by body is AB )

displacement = AB = 10m ( minimum length covered by body from A to B is AB )

second journey : body moves from B to A

distance = AB + BA = 10+10

=> distance = 20m

when body moves from B to A then..length is negative for finding displacement..

displacement = AB + (-BA) = 10-10 = 0

=> displacement = 0

so,

• distance in first case = 10m
• distance in second case = 20m
• displacement in first case = 10m
• displacement in second case = 0m

hence,

• total distance = 20m
• total displacement = 0m

so option (d) 20m, 0m is correct answer

Answer 2

DISTANCE = total area covered by a moving object= A to B + B to A = 10m + 10m = 20m

DISPLACEMENT = shortest distance covered by any object from the starting point to the end point= here starting point is A and the eng point is also A . so, there is no displacement taking place = displacement= 0m

Explanation:

(d) 20 m , 0 m