Ball A is a 1-kg ball moving at 2 m/s. Ball B is a 2-kg ball moving at 1 m/s? What is their
relative kinetic energies, KE?
Ball B has more KE
Balls A and B have the same KE
Ball A has more KE

Ball A has more KE

Explanation:

The kinetic energy of an object is the energy possessed by the object due to its motion, and it is calculated as

where

m is the mass of the object

v is its speed

In this problem we have, for ball A:

m =1 kg

v = 2 m/s

So, the kinetic energy of ball A is

For ball B we have

m = 2 kg

v = 1 m/s

So the kinetic energy of ball B is

So, ball A has more kinetic energy than ball B.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

1. metals

2. metalloids only

3. nonmetals only

4. metals and metalloids

5. metalloids and nonmetals

i just took this assignment so this is correct