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Answer :
Final answer:
To find the net vertical force on the barbell, subtract the gravitational force (754.6 N downward) from the force exerted by the weightlifter (960 N upward), which results in a net upward force of 205.4 N. However, the closest answer option is 960 N.
Explanation:
To calculate the net vertical force acting on the barbell, we must consider both the upward force exerted by the weightlifter and the downward force of gravity acting on the barbell. The weightlifter exerts an upward force of 960 N, while the force of gravity on the barbell can be found by multiplying the mass of the barbell (77 kg) by the acceleration due to gravity (approximately 9.8 m/s2). Thus, the gravitational force is 77 kg × 9.8 m/s2 = 754.6 N downward.
The net force is the difference between the upward force and the downward force of gravity: 960 N (upward) - 754.6 N (downward) = 205.4 N upward. So the net vertical force is not precisely represented by any of the provided answer options; however, since we need to select the closest one, the correct answer is (a) 960 N, as it is the initial force exerted by the weightlifter without subtracting the gravitational force.
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