A 90.0 kg person is running up the stairs at 0.500 m/s.The power needed to run up the stairs is
A) 441 Watts.
B) 395 Watts.
C) 302 Watts.
D) 275 Watts.
E) 257 Watts.

Question

Quizplus · Accepted Answer

The power needed is calculated using the formula P = mgh/t, where m is mass, g is gravity, h is height, and t is time. Since velocity v = h/t, we can use P = mgv. Substituting m = 90.0 kg, g = 9.8 m/s², and v = 0.500 m/s, we get P = 90.0 * 9.8 * 0.500 = 441 Watts.

A 900 Kg Person Is Running Up the Stairs at 0