Answer:
One is tension force that acts on the string and the other one is gravitational force that is acting on the pen and is therefore, the one that pulls the pen towards the ground. Therefore, the pen's motion is caused by the unbalanced force acting on the pen.
So, sum of the forces (or net force) = MA
In order to solve this equation, we just plug our numbers in,
3000N
Answer:
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A because endothermic reactions require a net gain of energy (in the form of heat)