Students investigated the acceleration of a 5 kg physics cart. When a force of 20 N was applied, the acceleration was found to be 4 m/s2. The investigation is done a second time with the same force, but the mass is doubled.
What would the acceleration be for the second investigation?
O A 2 m/s2
OB. 4 m/s2
OC 8 m/s2
O D. 10 m/s2

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.