A 60 kg jogger runs up a long flight of stairs in 4.0 s. The vertical height of the stairs is 4.5 m. Estimate the jogger’s power output. [g = 9.8…

JAMB Physics 2024 199 views
Source: JAMB · 2024

A 60 kg jogger runs up a long flight of stairs in 4.0 s. The vertical height of the stairs is 4.5 m. Estimate the jogger’s power output.

[g = 9.8 ms⁻²]

  1. 714 W
  2. 746 W
  3. 662 W ✓
  4. 678 W
Explanation

Power = work done ÷ time. The work done is the gain in potential energy: mgh = 60 × 9.8 × 4.5 = 2646 J.

Power = 2646 ÷ 4.0 = 661.5 W, which is about 662 W.

Was this explanation helpful?

Something wrong or missing? Tell us — we read every report and fix issues fast.

pastQuestions.ng pastquestions.ng