Throttle test questions

Test and analysis: at the beginning, the car moves at a uniform speed v 0, and the traction force f = f When the power of the car is reduced by half and the driving power is maintained, according to, the initial traction force will be reduced by half. According to, the car will slow down. As the speed decreases, the traction will gradually increase and the acceleration will gradually decrease. Finally, when the traction is equal to the resistance again, the car will move at a uniform speed of v 0 /2. Option b is correct.