A miracle car with a 100 efficient engine burns fuel having a 40-megajoules-per-liter energy content. If air drag and overall frictional forces at highway speeds totals 1000 N, what distance per liter can be achieved on the highway?
A) 30 km
B) 40 km
C) 50 km
D) more than 50 km
E) need more information
Question 2
A jack system will increase the potential energy of a heavy load by 1000 J with a work input of 2000 J. The efficiency of the jack system is
A) 10.
B) 20.
C) 50.
D) 80.
E) need more information
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