An object 'O' is placed at a distance of $100 \mathrm{~cm} in front of a concave mirror of radius of curvature 200 \mathrm{~cm} as shown in the figure. The object starts moving towards the mirror at a speed 2 \mathrm{~cm} / \mathrm{s}. The position of the image from the mirror after 10 \mathrm{~s} will be at _________ \mathrm{cm}$.
Choose the correct answer: