Question 1187005
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<pre>

Use the second Newton's law  F = m*a,


where F is the force in newtons; m is the mass in kilograms;  "a" is the acceleration in m/s^2.


Notice that the units must be consistent: convert 8000 grams to kilograms mass

    8000 grams = 8 kilograms.


After that, the calculation is straightforward:

    f = 8*5  = 40 newtons.
</pre>

Solved and thoroughly explained.


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For your education, see this link


https://www.physicsclassroom.com/class/newtlaws/Lesson-3/Newton-s-Second-Law



Happy learning (!)