In: Physics
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.
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