Jack has two boxes. one is 148g and one is 78g. if jack pushes both boxes with the same amount of force, which will accelerate faster? a. they will accelerate at the same rate, cause the same amount of force was applied b. niethier box wil accelerate c. the 148g box d. the 78g box

The 78g box, since it has less weight, would accelerate faster. If you had a frictionless surface, and you conducted this experiment, both boxes, without any outside forces, would accelerate at the same rate forever. However, in this problem we must assume the surface is not frictionless. Friction is determined by weight; the more weight, the more friction. Since the 78g box has less weight, it has less friction, making it easier to push with less force.

Constructive interference.

Explanation:

If the path difference between the two wave is,

Then this type of interference is constructive.

Here, is the wavelength and

According to the question, the two waves are in same phase  and in the midway the two sources are at equal distances the wave interfere and the path difference between them is zero.

Therefore, the interfere constructively.