Two perfectly elastic particles `A` and `B` of equal masses travelling along a line joining them with velocities `15 m//s` and `10m//s` respectively collide. Their velocities after the elastic collision will be (in m/s) respectively
A. `10 ms^(1-), 10ms^(1-)`
B. `15ms^(-1), 15ms^(-1)`
C. `10 ms^(-1), 15ms^(-1)`
D. `15 ms^(-1),10ms^(-1)`