A negative charge i guess
Answer:
14.3
Explanation:
The distance s as a function of time can be written as:

The rate of change is the derivative of d with respect to time:

The time t when the track has been traveling for 81 miles is given by:

Using t in the previous equation gives:

Answer:
When unbalanced forces act on an object at rest, the object will move. In the two examples mentioned earlier, the net force on the object is greater than zero. Unbalanced forces produced change in motion (acceleration) and the receivers of the forces - the piano and the rope - moved.
Answer:
Explanation: The periodic table contains rows and columns. To find how many valence electrons are in an element, simply locate the column number that it is in, and that determines the number of valence electrons in an element. This rule works only for elements excluding the transition metals
Explanation: