Answer: 16.5 m/sExplanation:
By law of conservation of energy:

--- (1)
Since k = Spring Constant = 850 N/m
x = 0.40 m
m = 500g = 0.5kg
v=?
Plug in the values in (1):
Answer: Resistance =
, Current = 1.56 A, Voltage =4.99 V
The resistance,

where,
is resistivity, A is the area and l is the length of the resistor.
It is given that:

Length, l=2 mm
Area, 
Hence, 
We know, Power, 



We know, Voltage, 
Answer;
-Period
Explanation;
-Properties of elements within a period on the periodic table change in a predictable way from one side of the table to the other. A period in the periodic table is a horizontal row. All elements in a row have the same number of electron shells.
-Elements in the same period have the same number of electron shells; moving across a period, elements gain electrons and protons and become less metallic.This arrangement reflects the periodic recurrence of similar properties as the atomic number increases.
Is this a book and most likely because the were cute