The power delivered by the student's biceps will be 51.45W.
This is defined as the amount of energy converted per unit and the SI unit is Watts.
Power = Energy/time
Force = ma = 42 kg × 9.8m/s² = 411.6N.
Energy = Force × distance
= 411.6N × 0.25m = 102.9J
Power = 102.9J/2s = 51.45W
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