Answer:
4.08 kg
Explanation:
We can apply the Newton's second law of motion to find the mass of this object:
[tex]F=ma[/tex],
where [tex]m[/tex] is mass, and [tex]a[/tex] is acceleration, which is substituted by [tex]g[/tex] here. Now, plugging given numbers in the equation, we have
[tex]40=m\cdot9.8[/tex].
Solving for mass, we have
[tex]m=\frac{40}{9.8}\\=4.08 \;\text{kg}.[/tex]
