Q.

Three boys are running on a equitriangular track with the same speed 5 m s-1. At start, they were at the three corners with velocity along indicated directions. The velocity of approach of any one of them towards another at t = 10 s equals

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a

7.5 ms-1

b

10 ms-1

c

5 ms-1

d

0 ms-1

answer is D.

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Detailed Solution

At t=10s,Along the line joining any two, vr=5cos⁡60∘−5cos⁡60∘=0
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Three boys are running on a equitriangular track with the same speed 5 m s-1. At start, they were at the three corners with velocity along indicated directions. The velocity of approach of any one of them towards another at t = 10 s equals