A certain motor uses 1300J of energy to raise a 30kg mass to a height 2.4 meters above where it started.
a) How much potential energy does the mass gain during the lift b) calculate the efficiency of this motor

false

explanation:

boats, things on boats luggage are way more heavy then water.

i think they are all correct

explanation:

they seem good

the answer would most likely be c, because if it's a comical piece of information, it may likely not be true, if it's a site that allows anybody to edit the content, it could mean a five year old is typing the info, and if it's a tv show produced by a celeb, it may have a biased opinion.