Mass of a bus is 2400 kg . `………` J . Work is to be done in producing velocity `36 (km)/h ` in .it

Options

A. `1.2 xx10^(6)`
B. `120 xx10^(6)`
C. `1.2 xx10^(5)`
D. `12xx10^(5)`

Answer

C

Explanation

m = 2400 kg , `v = 36 (km)/h = (36 xx1000)/3600 = 10 m//s `
Now , Work `W = K.E .K =1/2 "mv"^(2) " " ( :. "Taking " v_(0) = 0)`
` = 1/2 xx2400 xx10^(2)`
`= 1.2 xx10^(5) J `