The road distance between city A and B is 24km and the difference in altitude be

Question

The road distance between city A and B is 24km and the difference in altitude between them is 1400m (city B being the higher one) . An 1800kg car travel from A to B in 30 min, subject to a drag force of constant 560N magnitude. Neglecting any changes in kinetic energy, calculate a) the work done by the engine The road distance between city A and B is 24km and the difference in altitude between them is 1400m (city B being the higher one) . An 1800kg car travel from A to B in 30 min, subject to a drag force of constant 560N magnitude. Neglecting any changes in kinetic energy, calculate a) the work done by the engine The road distance between city A and B is 24km and the difference in altitude between them is 1400m (city B being the higher one) . An 1800kg car travel from A to B in 30 min, subject to a drag force of constant 560N magnitude. Neglecting any changes in kinetic energy, calculate a) the work done by the engine

Explanation / Answer

s = 24000m
work done by friction = sf = 24000*560 = 13440000 J
PE gained = mgh = 1800*9.8*1400 = 24696000 J
Work done by engine = PE gained + work done by friction = 38136000 J

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