Final answer:
The force acting on a block of mass 4.4404 kg with an acceleration of 2.8 m/s² is calculated using Newton's second law of motion and is found to be approximately 12.4 N, corresponding to option (a).
Step-by-step explanation:
The student's question involves calculating the force acting on a block with a given mass and acceleration. According to Newton's second law of motion (F = ma), the force acting on an object is equal to the mass of the object multiplied by its acceleration. Since the mass of the block is 4.4404 kg and the acceleration is 2.8 m/s², we can compute the force as follows:
F = m × a
F = 4.4404 kg × 2.8 m/s²
F = 12.43312 N
The closest answer to our calculation is 12.4 N, which corresponds to option (a). Therefore, the force acting on the block is 12.4 N.