Final answer:
The weightlifter exerts approximately 500 watts of power on the barbell during this time.
Step-by-step explanation:
The power exerted by the weightlifter can be calculated using the formula:
Power = Work / Time
First, we need to calculate the work done by the weightlifter. Work is given by the formula:
Work = Force x Distance
In this case, the weightlifter exerts an upward force of 1000 N on the barbell and holds it at a height of 1 meter. So, the work done is:
Work = 1000 N x 1 m = 1000 J
Now, we can calculate the power:
Power = 1000 J / 2 s = 500 W
Therefore, the weightlifter exerts approximately 500 watts of power on the barbell during this time.