An athlete whose mass is 94.0 is performing weight-lifting exercises. Starting from the rest position, he lifts, with constant acceleration, a barbell that weighs 600 . He lifts the barbell a distance of 0.50 in a time of 2.2 .

Is there a question here?

To find the force required to lift the barbell, we need to calculate the net force acting on the barbell during the lift. The net force is given by Newton's second law, which states that force is equal to mass multiplied by acceleration (F = m * a).

We are given the mass of the athlete (94.0 kg) and the weight of the barbell (600 N). The weight of an object is the force with which it is pulled towards the center of the Earth. Therefore, the weight of the barbell is equal to the force required to hold it up against gravity.

Since the athlete is lifting the barbell with constant acceleration, we can use the kinematic equation to find the acceleration. The equation is:

d = v₀ * t + (1/2) * a * t²

where d is the distance, v₀ is the initial velocity (which is zero in this case since the barbell starts from rest), a is the acceleration, and t is the time.

Plugging in the values, we have:

0.50 m = 0 * 2.2 s + (1/2) * a * (2.2 s)²

Simplifying the equation, we get:

0.25 m = 0.5 * a * 4.84 s²

Dividing both sides by 0.5 * 4.84 s², we get:

a = (0.25 m) / (0.5 * 4.84 s²)

a = 0.0516 m/s²

Now we can calculate the net force using Newton's second law:

F = m * a

F = 94.0 kg * 0.0516 m/s²

F ≈ 4.85 N

Therefore, the force required to lift the barbell is approximately 4.85 Newtons.