A car is on cruise control at v=30m/s. If the wind resistance is equal to. F=0.42v² what energy will the car expend to drive 1km? A)450J
B)378J
C)12.6J
D)378kJ

D)378kJ

Explanation:

Applying,

E = F×d Equation 1

Where E = Energy expanded by the car, F = Wind resistance, d = distance

From the question,

F = 0.42v² Equation 2

Susbtitute equation 2 into equation 1

E = 0.42v²d Equation 3

Given: v = 30 m/s, d = 1 km = 1000 m

Substitute these values into equation 3

E = 0.42(30²)(1000)

E = 378000

E = 378 kJ

Hence the right option is D)378kJ

the body's situation won't change the forces are equal opposit and on the same body

spare some change and give it to the poor

explanation:

plz : ((