A Weightlifter's Work on Barbell

Explanation:

Work Done on the Barbell:

Work done on any object is the measure of force required to move that object from one position to another. It is determined by the product of force acting on the object with the displacement of the object.

Given data:

Mass of the barbell (m) = 13.0 kg

Displacement (d) = 1.3 meters

Since the work involves lifting the barbell from the ground, the force applied to lift it should be in the opposite direction to the acceleration due to gravity.

Force = - Mass * Acceleration due to gravity = - 13 * 9.8 = -127.4 N

Now, using the formula for work done:

Work done = Force * Displacement

Work done = -127.4 * 1.3 = -165.62 Nm

Therefore, the work done on the barbell is -165.62 Nm.