The athlete-weightlifter raises a barbell weighing 150 kg for 1.5

The athlete-weightlifter raises a barbell weighing 150 kg for 1.5 seconds from the floor to a height of 2 m. Determine the power, equal to the athlete during this time.

Initial data: m (rod weight) = 150 kg; t (duration of lifting the barbell by a weightlifter) = 1.5 s; h (the height the weightlifter lifted the barbell) = 2 m.

Reference values: g (acceleration due to gravity) ≈ 10 m / s2.

The power that the athlete-weightlifter has developed will be equal to the ratio of the potential energy of the bar and the time of its rise: N = Ep / t = m * g * h / t.

Calculation: N = 150 * 10 * 2 / 1.5 = 2000 W (2 kW).

Answer: A weightlifter has developed a power of 2 kW in 1.5 seconds.