Friction and air resistance are absent

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Reference no: EM13650127

In which one of the following circumstances could mechanical energy not possibly be conserved, even if friction and air resistance are absent? why?

a) a car moves up a hill, its velocity continually decreasingalong the way
b) a car moves down a hill, its velocity continuallyincreasing along the way
c) a car moves along level ground at a constant velocity
d) a car moves up a hill at a constant velocity.

Reference no: EM13650127

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