When we can get the Kinetic energy from this formula KE= 1/2 M V^2
and we can get the potential energy from this formula PE = M g H
we can set that the kinetic energy at the bottom of the fall equals the potential energy at the top so,
KE = PE
1/2 MV^2 = M g H
1/2 V^2 = g H
when V is the velocity, g is an acceleration of gravitational force and H is the height of the fall.
∴ v^2 = 2 * 9.8 * 8 = 156.8
∴ v= √156.8 = 12.5 m/s
Answer :
(a) The name of
is, potassium dichromate.
(b) The name of
is, lithium oxalate.
(c) The name of
is, copper nitrate.
Explanation:
Ionic compound : It is a type of compound that is made up of the ions of the two different elements in which one element is a metal and another element is a non-metal.
(a) 
The given compound
is an ionic compound. It is made up of two different ions which are potassium ion
and dichromate ion
.
So, the name of
is, potassium dichromate.
(b) 
The given compound
is an ionic compound. It is made up of two different ions which are lithium ion
and oxalate ion
.
So, the name of
is, lithium oxalate.
(c) 
The given compound
is an ionic compound. It is made up of two different ions which are copper ion
and nitrate ion
.
So, the name of
is, copper nitrate.
The answers that are correct are a, b, and d
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