# Physics

posted by .

Car A has a mass of 1000kg and a speed of 60km/h, and car b has a mass of 2000kg and a speed of 30km/h. what is the ratio of kinetic energy of car A to that of car b?

• Physics -

KE1 = m1•v1²/2,
KE2 = m2•v2²/2,
KE1/ KE2 = m1•v1²/ m2•v2²,
where
m1=1000 kg, v1 = 60000/3600 m/s,
m2=2000 kg, v2 = 30000/3600 m/s

• Physics -

KE1= M1.v1'2/2
KE2= M2V2'2/2

KE1= [(1000kg)(277.89m'2/s'2)/2]
= 138944.45J
KE2= [(2000kg) (69.3889'2/s'2)/2]
= 69388.9J
KE1/KE2= 138944.45J/69388.9J

=2.00

## Similar Questions

1. ### Physics

A car of mass 1100 kg, moving with a speed of 73 mph on a highway, passes a small SUV with a mass 1 1 2 times bigger, moving at 1/2 of the speed of the car. (a) What is the ratio of the momentum of the SUV to that of the car?

Two cars are moving. The first car has twice the mass of the second car but only half as much kinetic energy. When both cars increase their speed by 3.41 m/s, they then have the same kinetic energy. a) What is the original speed of …
3. ### physics

An experimental flywheel, used to store energy and replace an automobile engine, is a solid disk of mass 202.0 kg and radius 0.35 m. (a) What is its rotational inertia?
4. ### Physics

A car with a total mass of 1.48 103 kg has wheels of radius 33.5 cm and moment of inertia 0.810 kg · m2. (a) Find the car's translational kinetic energy when the car is moving at a speed of 30.0 m/s. (b) Find the car's rotational …
5. ### physics

A car has a flywheel ( a diks of R=0.2m and uniformly distributed mass M=100kg) that can convert 25% of the rotational kinetic energy into translational kinetic energy. The mass of the car is 1000kg ( including flywheel). Suppose the …
6. ### physics

a car with a mass of 900kg and a car with a mass of 2000kg collide. one car is moved away from the impact point as one mass at 16.0m/s in the direction 24 degrees west of south. what was the initial speed of each car prior to the collision?
7. ### Physics

A car of mass 1000kg is travelling along a straight flat road at a constant speed of 30.0ms^-1. It then accelerates with constant acceleration of 3.00ms^-2 for 10.0s, after which it continues to travels at a constant speed. Determine: …
8. ### physics (urgent)

A car of mass 1000kg is travelling along a straight flat road at a constant speed of 30.0ms^-1. It then accelerates with constant acceleration of 3.00ms^-2 for 10.0s, after which it continues to travels at a constant speed. Determine: …
9. ### value

A Motor Car-A Moves With Constant Speed Of 60km/hr; A Car B Starts Chasing Car A After 20minutes The Car A Passed, Where And When Car B Overtaking Car A If Acceleration 10km/hr?
10. ### Physics

A car mass of 950 kg is initially travelling at 60km/h. Determine the final speed of the car when the speed increases so that it's kinetic energy increased by 165 kJ.

More Similar Questions