A5 kg object near earth's surface is released from rest such that it falls a distance of 10 m. after the object falls 10 m, it has a speed of 12 m/s. which of the following correctly identifies whether the object-earth system is open or closed and describes the net external force?
a. the system is closed, and the net external force is zero.
b. the system is open, and the net external force is zero.
c. the system is closed, and the net external force is nonzero.
d. the system is open, and the net external force is nonzero.

D

Explanation:

Given

mass of object

Distance traveled

velocity acquired

conserving Energy at the moment when object start falling and when it gains 12 m/s velocity

Initial Energy

Final Energy

where is friction work if any

Since Friction is Present therefore it is a case of Open system and net external Force is zero

An open system is a system where exchange of energy and mass is allowed and Friction is acting on the object shows that system is Open .

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.

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