181k views
4 votes
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

User Starlette
by
8.3k points

2 Answers

5 votes
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.
User Sebastian Vom Meer
by
7.8k points
3 votes

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,


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.

User Brijesh Dhanani
by
8.7k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.