Answer:
K_f = 20000 J
Explanation:
This is a conceptual exercise, where the relationship between work and kinetic energy should be used
W = ΔK
W = K_f - K₀
In this case, as the car is damaged, its initial velocity is zero and therefore its initial kinetic energy is also zero.
W = K_f
consequently the work is completely transformed into kinetic energy of the car
K_f = 20000 J
