A particle moves perpendicularly towards a plane mirror with a constant speed of 4 cm/s. What is the speed of the image observed by an observer moving with 2 cm/s along the same direction? Mirror is also moving with a speed of 10 cm/s in the opposite direction. (All speeds are with respect to ground frame of reference)
a. 4 cm/s
b. 12 cm/s
c. 14 cm/s
d. 26 cm/s