A spot light `S` rotates in a horizontal plane with a constant angular velocity of `0.1 rad//s`. The spot of light `P` move along the wall at a disatnce `3 m`. What is the velocity of the spot `P` when `theta = 45^(@)` ?
A. 0.6m/s
B. 0.5m/s
C. 0.4m/s
D. 0.3m/s