To calculate the force the athlete must exert to lift the bar, we need to consider the force of gravity acting on it. The gravitational force can be calculated using the formula:
\[ F = m \times g \]
where:
- \( F \) is the force (in newtons),
- \( m \) is the mass (in kilograms),
- \( g \) is the acceleration due to gravity (approximately \( 9.8 , \text{m/s}^2 \)).
Here, the mass \( m \) is 100 kg and \( g \) is 9.8 m/s².
Calculating the force:
\[ F = 100 , \text{kg} \times 9.8 , \text{m/s}^2 = 980 , \text{N} \]
Thus, the athlete must exert 980 N of force to lift the loaded bar and overcome the force of gravity.
The correct response is:
980 N