In the blank should go of friction.
Answer:
The answer is in the attachment
Explanation:
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To solve this problem we must basically resort to the kinematic equations of movement. For which speed is defined as the distance traveled in a given time. Mathematically this can be expressed as

Where
d = Distance
t = time
For which clearing the time we will have the expression

Since we have two 'fluids' in which the sound travels at different speeds we will have that for the rock the time elapsed to feel the explosion will be:


In the case of the atmosphere -composite of air- the average speed of sound is 343m / s, therefore it will take


The total difference between the two times would be


Therefore 3.357s will pass between when they feel the explosion and when they hear it
To analyze the differences in acceleration of the two objects, a necessary formula/relation to remember here is force = mass * acceleration. Given the different data in the problem, we can solve for the acceleration of each object. This is shown below:
Force = 15 N
M1 = 25 kg
M2 = 50 kg
a1 = ?
a2 = ?
For object 1:
15 N = 25 kg * a
a = 0.6
For object 2:
15 N = 50 * a
a = 0.3
Therefore, the acceleration of Object B is half that of Object A.
B.The shorter a wire is, the higher the resistance will be