One kilowatt-hour represents
A) 1 N.
B) 60 N/s.
C) 60,000 W.
D) 3.6 million joules.
E) none of these
Question 2
Which task requires more work?
A) lifting the 50-kg sack 2 meters
B) lifting the 25-kg sack 4 meters
C) both require the same
D) need more information