The energy required to accelerate a car from 10 m/s to 20 m / s is how many times the energy required to accelerate the car from rest to 10 m /s

Options

A. Work done on the object in 30 s is zero
B. 2 W
C. 3 W
D. 4 W

Answer

C

Explanation

(c ) `W=(1)/(2)xxmxx(10)^(2)=50 m`
`W'=(1)/(2)mxx(400-100)=150 m=3W`