A block of wood of mass 5kg is pulled on a platform by a force of 40N as illustrated in the diagram above. If the frictional force, F experienced by the block is 12N, calculate the magnitude of the acceleration of the acceleration of the block

• A.2.4ms^-2
• B.5.6ms^-2
• C.8.0ms^-2
• D.2.4ms^-2