How much work is it to lift a 2.0 kg sack of potatoes vertically 6.5 m?

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

If a star is moving toward earth, it is

An electron in an x-ray machine is accelerated through a potential difference of 1.00 × 104 v before it hits the target. what is the kinetic energy of the electron in electron volts?