An automobile having a mass of 1100 kg initially moves along a level highway at 110...

An automobile having a mass of 1100 kg initially moves along a level highway at 110 km/h relative to the highway. It then climbs a hill whose crest is 80 m above the level highway and parks at a rest area located there. Use a reference with kinetic and potential energy each equal to zero for the stationary highway before the hill.
Let g = 9.81 m/s².

For the automobile, determine its change in kinetic energy and its change in potential energy, both in kJ.

Solutions

Expert Solution

The automobile initially moves along the level highway with speed vi=110Km/hr and

finally at the top of the hill comes to rest i.e. vf=0Km/hr

also initially height is zero and final height is 80 m

we should know formula for P.E and K.E

K.E = 1/2 m v²

P.E = mgh

By this we can easily find change in K.E and P.E

genius_generous answered 2 years ago

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