$A$ man pushes a box of mass $50\, kg$ with a force of $80\, N$. What will be the acceleration of the box due to this force? What would be the acceleration if the mass were doubled?

(N/A) Given: Mass $m = 50\, kg$,Force $F = 80\, N$.
Using Newton's second law of motion,$F = m \times a$,the acceleration $a$ is given by:
$a = F / m = 80 / 50 = 1.6\, m/s^2$.
If the mass is doubled,the new mass $m' = 2 \times 50 = 100\, kg$.
The new acceleration $a'$ is:
$a' = F / m' = 80 / 100 = 0.8\, m/s^2$.