A vehicles of mass 10 quintals climba up a hill 200m high and thenmoves on a level road with a velocity of `36km//h` .Calculate its total mechanical energy while running on the top of the hill.

Explanation

Here, `m=10` qunitals`= 1000kg.`
`h=200m.`
`v=36km//h=(36xx1000)/(60xx60)m//s=10m//s.`
Potential energy gained.
`U=mgh=1000xx9.8xx200=1.96xx10^(6)J`
KE of car, `k=(1)/(2)mv^(2)=(1)/(2)xx1000(10)^(2)`
`=0.5xx10^(5)J`
Mechanical energy `=U+K`
`=1.96xx10^(6)+0.5xx10^(5)=2.01xx10^(6)J`