A5.8x10 ^4 watt elevator motor can lift a total weight of 2.1 x10^4 newtons with a maximum constant speed of

The formula for power is used to solve for the speed. Given are P = 5.8x10^4 W and W = 2.1 x10^4 N = F. Formula: v =P / F this would result to v = 5.8 x10^4 W / 2.1x10^4 N = 2.76 m/s. I hope this helps you 

The charge of an ion with 55 protons and 52 electrons is +3. the reason is because protons are positive, and there are three more than the amount of negative electrons.