You can
put this solution on YOUR website! .
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.
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 (!)