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Q.

An ant moves on the floor of a room making two displacements. One of magnitude 3 m and another of magnitude 4 m . If the angle between the two displacements is 120°  what will be the magnitude of the resultant displacement

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a

6.082 m

b

3.606 m

c

4.8 m

d

5.2m

answer is D.

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Detailed Solution

Question Image

R¯=P2+Q2+2PQcosθ

=32+42+2×4×3cos120

=25+24×−1/2

=25−12

=13=3.606 m

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