A horizontal force F produces an acceleration of \(6m/s^2\) on a block resting on a smooth horizontal surface. The same force produces an acceleration of \(3 m/s^2\) on a second block resting on a smooth horizontal surface. If the two blocks are tied together and the same force acts, the acceleration produced will be

• A. \(1 m/s^2\)
• B. \(2 m/s^2\)
• C. \(4.5 m/s^2\)
• D. \(9 m/s^2\)