Answer:
5
Step-by-step explanation:
first multiply 3 by 7 as 3x7=21
again find the square of 4 as 4^2=16
finally, subtract 16 from 21 as 21-16= 5
We have to use the following formula which is

Given values of F and m are 7.92 Newtons and 3.6 kilograms .
Substituting these values in the formula, we will get

To solve for a, we have to divide both sides by 3.6 that is

And that's the required answer .