A rigid rod of length 1 m is resting at an angle q = 45o as shown in the figure

Q. A rigid rod of length 1 m is resting at an angle q = 45^o as shown in the figure. The end P is dragged with a velocity of U = 5 m/s to the right. At the instant shown, the magnitude of the velocity V (in m/s) of point Q as it moves along the wall without losing contact is

(A) 5                           (B) 6                           (C) 8                          (D) 10

Ans: 5