Answer:
The power of a weightlifter is 100.5 Watt.
Explanation:
- Power is the rate at which the work is done. It can also be defined as the amount of energy converted or transferred in to other forms per unit time.
- Mathematically,
Power=Workdone/Timetaken
- In this case, work is done by lifting the 614.7 N barbell against gravity given by the potential energy.
- Potential Energy = mgh= Force* distance= 614.7*4.48=2753.85 J.
- Now, Power= Workdone/Timetaken= 2753.85/27.4=100.5 Watts
Therefore, the power of a weight lifter when a 614.7 N barbell is lifted 4.48 m in 27.4 seconds is 100.5 Watt.
