Answer:
C Thy make the force exert all at once
We have that The net force acting on the table is
Fn=14N
From the question we are told
tom and huck are pulling a table in the same direction at the same time with 7N of force each,what is the net force acting on the table
Generally the equation for the Net Force is mathematically given as
Fn=Toms Force +Hucks Force
Therefore
Fn=7+7
Fn=14N
In conclusion
The net force acting on the table is
Fn=14N
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technically usually the warmer object/substances particles move master which causes friction among the particles plus the kinetic energy being converted to thermal energy, so i would say the hand.
The salinity of the water and lower temperatures causes ocean water to be denser.