Answer :
Final answer:
The net vertical force acting on the barbell is 205.4 N upward, calculated by subtracting the force of gravity (754.6 N downward) from the force exerted by the weightlifter (960 N upward).
Explanation:
The question deals with calculating the net vertical force acting on the barbell. To find this, we subtract the force of gravity acting on the barbell from the force exerted by the weightlifter. The force of gravity on the barbell is its mass multiplied by the acceleration due to gravity (9.8 m/s2), which is 77 kg × 9.8 m/s2 = 754.6 N downward.
The weightlifter exerts an upward force of 960 N. Therefore, the net vertical force (Fnet) is the upward force minus the downward force of gravity:
Fnet = 960 N (upward) - 754.6 N (downward) = 205.4 N (upward)
So, the net vertical force acting on the barbell is 205.4 N upward.
