II. An electric motor raises the container of a liquid a vertical distance of 7.5 m in only 6.0 s. During this time its power input is 9.5 kW. a) How much work does the motor do on the liquid? b) How much power does the motor generate while it is raising the liquid? c) What is the percentage efficiency of the motor? How to calculate without mass given?

I have tried everything but mass not given is the