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Lakhmir Singh & Manjit Kaur - Physics

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Q. 573.8( 13 Votes )

A body travels a distance of 3 km towards East, then 4 km towards North and finally 9 km towards east.
(i) What is the total distance travelled?

(ii) What is the resultant displacement?

Class 9th Lakhmir Singh & Manjit Kaur - Physics Name

Answer :

1) Total distance =3+ 4 + 9 = 16 Km

2) Total displacement = 12.6 km

The net displacement in east direction is 3+9=12 km

The net displacement in north direction is 4 km

The net displacement in south and west direction is zero

Using, pythagorean theorem

displacement(d)=√(12²+ 4²)=√(144+16)=√(160)=12.6 km

Hence, The displacement of body is 12.6 km in north-east direction

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PREVIOUSIf on a round trip you travel 12 km and then arrive back home:(a) What distance have you travelled?(b) What is your final displacement?NEXTA boy walks from his classroom to the bookshop along a straight corridor towards North. He covers a distance of 40 m in 50 seconds to reach the bookshop. After buying a book, he travels the same distance in the same time to reach back in the classroom. Find (a) average speed, and (b) average velocity, of the boy

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