Which statements correctly describe forces? check all that apply.

forces have the ability to change an object’s state of motion.
forces are vectors.
forces are measured in joules.
forces are measured in newtons.
forces can have a positive or negative value to indicate direction.

1. Forces have the ability to change an object’s state of motion.

TRUE

As per Newton's first law when unbalanced force act on an object then the state of motion of the object will change.

2. Forces are vectors.  

TRUE

Since forces must have direction along with their magnitude so it is vector

3. Forces are measured in joules.

FALSE

Force is measured in Newton in SI unit or we can use kg m/s/s as its unit while Joule is the SI unit to measure energy

4. Forces are measured in newtons.

TRUE

Force is measured in Newton in SI unit system for the honor of Sir Issac Newton

5. Forces can have a positive or negative value to indicate direction.

TRUE

Since force is a vector quantity so it represents positive or negative for the presentation of direction.

lol

explanation:

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