<span title="Physics?????????????????????????">Physics??????????????????...</span>

Question

which of following is not a unit of energy:

a)J

b)kg * m^2/s^2

c)W-s

i think b because its supossed to be kg*m/s^2

Answer 1

kg*m/s^2 is a newton

Answer 2

A) a Joule (J) is a unit of energy

B) kg m^2/s^2 = m v^2 which is also a  unit of energy (the first answer seems to have missed that it is s^2)

C) Watts (W) are J/s, so W x s = J/s x s = J

they are all units of energy