My first question friends please help me
Write the answer with steps !!!

Mixing salt in water is an example of physical change

What is the speed vfinal of the electron when it is 10.0 cm from charge 1?

Pressure is a measure of force per unit area or p=f/ap=f/a. a student is checking the amount of pressure their car exerts upon the road. the car weighs 22 tons ( us short ton ). the student finds the dimensions of each tire's footprint on the road is 12.5 cm x 16.5 cm. in pounds per square inch (psi), what is the total pressure the car exerts upon the road?