A student investigates the motion of a toy vehicle. The student graphs 40 seconds of data from the investigation
Motion of a Toy Vehicle
15
10
Distance
(meters)
0
10 20
30 40 50
Time (seconds)
Which statement best describes the motion of the toy vehicle during the first 30 seconds of the
investigation?
The vehicle was traveling at a constant speed.
The vehicle was accelerating at a constant rate.
I
The speed of the vehicle was increasing.
The acceleration of the vehicle was increasing.

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.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

the cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.