This is a multiple choice question where no numbers or values are give; however, I sure it can be deduced through logic. The question: The mass in the race consists of the mass of the car and the mass of the fuel. The mass of the fuel decreases as the car completes its journey around the lap. Why does the lap time decrease with each consecutive lap. The question never stated that there was friction between the car and the track, so I assumed it wasn't the correct answer. Therefore, I managed to reduce it down to two solutions, those being Both the acceleration and deceleration increase The maximum velocity of the race car increases I've reasoned that the maximum velocity of the race must increase in order that momentum is conserved. However, some of my classmates have said that the other solution is correct. So, hopefully someone here can clear things up for me-thanks for any help!