Answer:
The first car has the most kinetic energy.
Step-by-step explanation:
Given that,
For first car
Mass of car = 1500 kg
Speed of car = 5 m/s
For second car
Mass of car = 1300 kg
Speed of car = 3 m/s
For third car
Mass of car = 1200 kg
Speed of car = 2 m/s
For fourth car
Mass of car = 1400 kg
Speed of car = 4 m/s
The kinetic energy is defined as,

Where, m = mass
v = velocity
The kinetic energy of first car,


The kinetic energy of second car,


The kinetic energy of third car,


The kinetic energy of fourth car,


Therefore, The first car has 18750 J kinetic energy.
Hence, The first car has the most kinetic energy.