The correct answer is C. The potential at the center of the sphere is the same as
the potential at the surface
_______________________//__/1 amu
–9.8 m/s<span>2
Just took it and got it right!</span>
Power
is calculated by dividing the work done with the time interval of the motion.
Work, on the other hand, is force times the distance traveled. Therefore, we
can calculate as follows:<span>
Power=W/t = mgd/t
90 = 60(9.81)d / 40
d = 6.12 m
Number of steps = 20/6.12 = 3.27 or 3 steps</span>
