posted by anoynomous on .
a weightlifter raises a 200-kg barbell with an acceleration of 3 m/s. How much force does the weightlifter use to raise the barb?
To maintain the weight at the same place, the force required is mg.
To accelerate upwards at acceleration a=3m/s², he/she must apply an additional force of ma.
So the total force is
m=mass of weight
g=acceleration due to gravity
A weightlifter raises a 200-kg barbell through a height of 2 m in 2.2 s. The average power he develops during the lift is