so assume v = 2 and m = 3 then the KE would be 6. Now assume v = 2 and m = 2 then KE would be 4, so the KE increases if the mass increases and velocity is constant.
PE = mgh
g = 10 assume h = 10 and m = 10
then PE = 1000
now g = 10 h = 10 but m = 5
then PE = 500 so, if m decreases, pe also decreases