Arrange the examples in order, starting with the object that has the least amount of energy. in each case, assume there’s no friction. use g = 9.8 m/s2, pe = m × g × h, and .

tiles
a book with a mass
of 0.75 kilograms
resting on a shelf at a
height of 1.5 metersa brick with a mass of
2.5 kilograms falling
with a velocity of
10 meters/second
when it’s 4 meters
above grounda ball with a mass of
0.25 kilograms rolling
on flat ground with a
velocity of
10 meters/seconda stone with a mass
of 0.7 kilograms being
held still at a height of
7 meters

a book with a mass  of 0.75 kilograms  resting on a shelf at a  height of 1.5 meters<  a ball with a mass of   0.25 kilograms rolling  on flat ground with a  velocity of  10 meters/second< a stone with a mass  of 0.7 kilograms being  held still at a height of  7 meters< a mass of  2.5 kilograms falling  with a velocity of  10 meters/second  when it’s 4 meters  above ground

Explanation: Gravitational potential energy is the energy possessed by an object due to its position or height.Kinetic energy is the energy possessed by an object by virtue of its motion.

m= mass of object

g= gravity

h= height of an object

v= velocity of object

A) a book with a mass  of 0.75 kilograms  resting on a shelf at a  height of 1.5 meters

B)  a mass of  2.5 kilograms falling  with a velocity of  10 meters/second  when it’s 4 meters  above ground

total energy= (K.E+P.E) =(125+98) =223J

C) a ball with a mass of   0.25 kilograms rolling  on flat ground with a  velocity of  10 meters/second

D) a stone with a mass  of 0.7 kilograms being  held still at a height of  7 meters

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form