1.

A car of mass `1000kg` moves from point `A` to `B`. If kinetic energy of car at point `A` is `100KJ` and at `B` is `220 Kj`. Then find work done by friction force on the car ? A. `-100kJ`B. `100kJ`C. `-20kJ`D. `20 kJ`

Answer» Correct Answer - D
By using work energy theorm,`W=DeltaKE`
`rArrW_(gravity)+W_(f riction)=DeltaKE`
`rArrmgh+W_(f riction)=120xx10^(3)rArrW_(f riction)=20kJ`


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