Question

Three boys are running on a equitriangular track with the same speed `5 ms^(-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

A. `7.5 ms^(-1)`
B. `10 ms^(-1)`
C. `5 ms^(-1)`
D. `0ms^(-1)`

Answer 1

Correct Answer - D
d. At t = 10 s.

Along the line joining any two, `v_r = 5cos60^@ - 5 cos 60^@ =0` .