Question

select the correct answer.
in a factory, a robot arm exerts a force on packed boxes to move them along a track to a waiting truck. the boxes are stationary until the arm pushes them. there are two kinds of packed boxes, box a and box b. box b has more mass than box a. which sentence is true about the boxes?
the acceleration of box b is less because it has more mass.
the acceleration of box b is more because it has more mass.
the acceleration of box a and box b is the same because mass has no effect.
the acceleration of box b is in the negative direction because it has more mass.

Explanation:

Step1: Recall Newton's second law

$a = \frac{F}{m}$

Step2: Assume same force F

$a \propto \frac{1}{m}$

Step3: Box B has larger mass

$a_B < a_A$

Answer:

A. The acceleration of box B is less because it has more mass.