Answer :
Answer:
The kinetic energy of the car at the top of the hill is 140280 Joules.
Explanation:
Mass of the car, m = 620 kg
Speed of the car, v = 24 m/s
Height of the hill, h = 30 m
The engine can produce up to 144,000 J of work during that time, W = 144,000 J
We need to find the kinetic energy of the car at the top of the hill. It can be calculated using conservation of mechanical energy as :
[tex](mgh+K)-\dfrac{1}{2}mv^2=144000[/tex]
[tex](620\times 9.8\times 30+K)-\dfrac{1}{2}\times 620\times (24)^2=144000[/tex]
[tex]620\times9.8\times30+K=322560[/tex]
[tex]K=140280\ J[/tex]
So, the kinetic energy of the car at the top of the hill is 140280 Joules. Hence, this is the required solution.