Final answer:
The work done by the weightlifter is 2375 J.
Step-by-step explanation:
The work done by the weightlifter can be calculated using the formula: work = force x distance. In this case, the force exerted by the weightlifter is the weight of the barbell, which is 950 newtons, and the distance is 2.5 meters. Therefore, the work done is calculated as:
Work = 950 N x 2.5 m = 2375 J
So, the weightlifter did 2375 J of work.