# Question #5fb0a

##### 2 Answers

The maximum speed at the bottom of the drop is

3-The speed at the bottom of the drop is independent of the mass of the car.

#### Explanation:

To find the speed of the car we will need to find how long (seconds) it will fall.

*Frictionless fall* gravity time is:

Then we can determine the falling velocity by:

The gravity equations are here:

https://www.mansfieldct.org/Schools/MMS/staff/hand/lawsgravprac.htm

To calculate the speed of the car at the bottom of the drop if its mass were doubled, we would find that there is no reference to *mass* in *gravity equations*. That immediately indicates: "The speed at the bottom of the drop is independent of the mass of the car."

Information on free-falling objects is here:

http://www.physicsclassroom.com/class/1DKin/Lesson-5/The-Big-Misconception

**Important Note:** If the mass were doubled, there would be a

https://socratic.org/questions/how-does-kinetic-energy-change-when-velocity-is-doubled#102211

Part A

Using Law of Conservation of Energy, kinetic energy at the bottom of drop equals change in potential energy. Ignoring frictional losses

Inserting given values and taking

Part B

3. Evident from equation (1)