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Q.

A person walks first 10 km north and then 20 km east, then the resultant displacement vector is

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a

22.36 km

b

22.46 km

c

25.23 km

d

20 .36 km

answer is A.

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Detailed Solution

See figure.|R|=P2+Q2+2PQcos⁡θ=P2+Q2 ∵θ=90∘=(10)2+(20)2=22⋅36km
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A person walks first 10 km north and then 20 km east, then the resultant displacement vector is