Before slowing down, the car's speed is 25 m/s, and its kinetic energy is ...
(1/2) (1,500 kg) (25 m/s)²
= (1/2) (1,500 kg) (625 m²/s²)
= 468,750 joules .
After slowing down, the car's speed is 15 m/s, and its kinetic energy is ...
(1/2) (1,500 kg) (15 m/s)²
= (1/2) (1,500 kg) (225 m²/s²)
= 168,750 joules.
The car lost (468,750 - 168,750) = 300,000 joules of K.E.
The law of Conservation of Energy says:
That 300,000 joules had to go somewhere.
If it's a standard, gas-powered car, then the kinetic energy got put into the brakes. The energy turned into heat, and the heat was carried off in the air.
If it's a more modern electric or hybrid car, then the kinetic energy spun the wheel motors, turning them temporarily into electrical generators. The generators converted the kinetic energy into electrical energy, which got put back into the car's batteries, and could be used again. That's why electric cars use less gas.
Each stream in a drainage system drains into a certain area. In a drainage basin the water falling in the basin drain will fall into the same stream. A drainage divides drawing basin from other drainage basins
