A railroad car undergoes an acceleration of 2.00 m/s2 when a net force of 40,000. N acts upon it. What is the mass of the railroad car?

The mass of the railroad car is 20,000 kg

Explanation:

Mechanical Force

According to the second Newton's law, the net force exerted by an external agent on an object of mass m is:

F = ma

Where:

a = acceleration of the object.

m = mass.

F = Net force

The railroad car undergoes an acceleration of when a net force of F=40,000 N acts upon it.

It's required to find the mass of the railroad car, which can be done by solving the formula for m as follows:

Substituting:

The mass of the railroad car is 20,000 kg

car stops. he keeps going = he has inertia

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form