The correct letter answer choice is A. We just finished up genetics in 8th grade science. You're welcome :)
Answer:

Explanation:
<u>Net Force</u>
Newton's second law explains the dynamics principles when a number of forces are applied to an object.
The net force vector is the sum of the individual vector forces applied. The magnitude of the net force is related to the magnitude of the acceleration of the body as follows:

Furthermore, the acceleration can be calculated if we know the kinematic behavior of the body:

Where vf, vo, and t are the final speed, initial speed, and time, respectively.
The box is pushed across the floor with a force of 25 N against a frictional force of 14 N.
The net force applied to the box is:

We also know the box is accelerated from rest (vo=0) to vf=4 m/s in t=16 seconds, thus:


From the equation:

We solve for m:


Well, in order to figure out the answer is to divide until you figure out how many miles they went per second. If it takes 5 seconds to reach 50 miles per hour it took 10 seconds per every 10 miles meaning each mile took 1 second. (Not actually possible but the answer) So, If it finished a 100 mile trip in 2 hours it took an hour for 50 miles. If it took 1 hour for 50 miles divide 60/50 which gets you 1.2 so it took 1.2 miles per minute meaning the car went 120 miles per hour I believe. I hope this helps :)
I'd say an insulator
Hope this helps!!!
Answer:
I think false I don't know if I right but I hoped this help