Aweightlifter lifts a 1250n barbell 2m in 3s. how much power was used to lift the barbell

Work = (force) x (distance)

         =  (1,250 N) x (2 m)  =  2,500 N-m  =  2,500 Joules

Power = (work)  /  (time to do the work)

           =  (2,500 J) / (3 sec)  =  2500/3  J/s  =  833-1/3 watts

                                                                   (1.12 horsepower)