Answer:
A chemical change produces a new substance, while a physical change does not
You can find your answer here www.rsc.org/education/teachers/resources/jesei/minerals/students.htm
Answer:

Explanation:
From the question we are told that:
Length 
Voltage 
Frequency 
Generally the equation for maximum Electric Field is mathematically given by



Potential energy = mgh
Potential energy = 2 x 9.8 x 1
Potential energy 19.6 J
Answer:
<h3>The answer is 10 m/s</h3>
Explanation:
The average speed of the ball can be found by using the formula

d is the distance
t is the time taken
From the question we have

We have the final answer as
<h3>10 m/s</h3>
Hope this helps you