To determine the force the athlete must exert to lift the loaded bar, you can use the formula for gravitational force:
\[ F = m \cdot g \]
where:
- \( F \) is the force (in newtons, N),
- \( m \) is the mass (in kilograms, kg),
- \( g \) is the acceleration due to gravity (approximately \( 9.8 , \text{m/s}^2 \)).
In this case, the mass \( m \) is 100 kg. Plugging in the values:
\[ F = 100 , \text{kg} \cdot 9.8 , \text{m/s}^2 \] \[ F = 980 , \text{N} \]
Therefore, the athlete must exert a force of 980 N to lift the loaded bar and overcome the force of gravity.
So the correct answer is:
980 N