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Answer :
Final answer:
The net vertical force acting on the barbell is the lifter's upward force minus the downward force of gravity on the barbell. After calculation, the net force is found to be 205 N upward, which does not match any of the given options, suggesting an error in the question's choices.
Explanation:
The question is asking to find the net vertical force acting on a barbell when a weightlifter exerts an upward force. To calculate the net force on an object, we need to consider all the individual forces acting on that object and sum them up according to their directions. In this case, we have two forces to consider: the upward force exerted by the weightlifter and the downward force of gravity acting on the barbell (which is its weight).
The weight of the barbell can be calculated by using the equation for weight, W = m × g, where m is the mass and g is the acceleration due to gravity (approximately 9.8 m/s2). The weight of the 77 kg barbell is therefore 77 kg × 9.8 m/s2 = 754.6 N (rounded to 755 N for simplicity). We take the upward force exerted by the lifter, 960 N, and subtract the downward force of gravity (755 N), yielding a net force of 205 N upward.
Thus, the net vertical force acting on the barbell is not one of the options provided (a-d), but rather 205 N upward, which indicates a possible error in the multiple choice options given.
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