Answer:
- 20 N
Explanation:
20 N - 40 N = - 20 N
The resultant force is - 20 N.
The mass of an air can be derived from the equation from density, where D=m/v. Multiply each sides by v making the equation m= Dv. Substituting the values for density and volume. m = (1.225 kg/m3)(10x20x4)m3 gives a result of 980 kg.