Power expended by Gerry expend in her running upstairs is 533.33 Hz
Step-by-step explanation:
Power is the ratio of work to time.
Work is the product of force and displacement.
Work = Force x Displacement
W = F x s
W = 500 x 8 = 4000 J

Power expended by Gerry expend in her running upstairs is 533.33 Hz