Explanation :
It is given that :
Mass of man, m = 10 kg
Force, F = 50 N
Distance, d = 10 m
We know that, the work done depends on the following factors :
\(W = Fd cos\theta\)
where,
\(\theta\) is the angle between force and the displacement.
In this case, a man carries a 10 kg sack of groceries in his arms with a force of 50 N as he walks forward a distance of 10 m. His weight mg will act downward and the displacement is forward.
So, the angle between force and displacement is 90.
\(W =50\times 10\times cos(90)\)
This implies, work done W = 0
Hence, this is the required solution.
