Answer:
The first car has the most kinetic energy.
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,
\(K.E=\dfrac{1}{2}mv^2\)
Where, m = mass
v = velocity
The kinetic energy of first car,
\(K.E =\dfrac{1}{2}\times1500\times(5)^2\)
\(K.E=18750\ J\)
The kinetic energy of second car,
\(K.E =\dfrac{1}{2}\times1300\times(3)^2\)
\(K.E=5850\ J\)
The kinetic energy of third car,
\(K.E =\dfrac{1}{2}\times1200\times(2)^2\)
\(K.E=2400\ J\)
The kinetic energy of fourth car,
\(K.E =\dfrac{1}{2}\times1400\times(4)^2\)
\(K.E=11200\ J\)
Therefore, The first car has 18750 J kinetic energy.
Hence, The first car has the most kinetic energy.
