The answer is A........The sound is transferred by collisions of molecules. Therefore sound waves will travel faster on warm air because collisions of molecules of air in warm air are greater.
A car slowing as it reaches a traffic light, because it is the only option with acceleration/ deceleration.
And forces require the mass of the object AND the acceleration.
I think the correct answer from the choices listed above is option D. Scientists would use a control sample that has no dna from bighead carp in edna surveillance in order to to verify that no dna has contaminated the gel. It would eliminate certain errors in the experiment.
Hi C is the Answer I believe
<u>Velocity here =displacement /time take</u>
<u>v=45-33/3</u>
<u>v=12/3</u>
<u>v=4 m/s</u>
