Answer: 490.5 N
Step-by-step explanation:
In this case, the only two forces acting on the mass are the person's strength (i.e. the force in question) and the weight of the mass.
The sum of the forces is equal to 0. This means that Force (person) = Force (weight).
Fp = Fw = m * gravity
Fp = 50 kg * 9.81 m/s^2
Fp = 490.5 (kg*m/s^2)
Fp = 490.5 N