Question

Which car has the most kinetic energy? A car of mass 1500 kg with speed 5 m/s or A car of mass 1300 kg with speed 3 m/s or a car of mass 1200 kg with speed 2 m/s or a car mass 1400 kg with speed 4 m/s

Answer 1

The formula to find the kinetic energy of an object is:

KE = 1/2 MV^2

So if we plug in the information
1/2 x 1500 x 5^2
1/2 x 1500 x 25
750 x 25
Car 1 has a KE of 18750

If needed you can find the other three on your own. It'd be good practice.

The answer is car 1.

Answer 2

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,

`K.E=(1)/(2)mv^2`

Where, m = mass

v = velocity

The kinetic energy of first car,

`K.E =(1)/(2)*1500*(5)^2`

`K.E=18750\ J`

The kinetic energy of second car,

`K.E =(1)/(2)*1300*(3)^2`

`K.E=5850\ J`

The kinetic energy of third car,

`K.E =(1)/(2)*1200*(2)^2`

`K.E=2400\ J`

The kinetic energy of fourth car,

`K.E =(1)/(2)*1400*(4)^2`

`K.E=11200\ J`

Therefore, The first car has 18750 J kinetic energy.

Hence, The first car has the most kinetic energy.