$"""$

Program: Momentum Calculator

Author: Ken Lambert

This program calculates the momentum of an object based on its mass and velocity. Momentum is defined as the product of an object's mass and its velocity.

The user will be prompted to input:

$1.$ The mass of the object in kilograms.

$2.$ The velocity of the object in meters per second.

Pseudocode:

$1.$ Prompt the user to input the mass of the object in kilograms.

$2.$ Prompt the user to input the velocity of the object in meters per second.

$3.$ Calculate the momentum using the formula: momentum $=$ mass $*$ velocity.

$4.$ Display the calculated momentum to the user with an appropriate label.

$"""$

def get$\_$positive$\_$float$($prompt$)$:

$"""$Function to get a positive float from the user."""

while True:

try:

value $=$ float$($input$($prompt$))$

if value $<0$:

print$("$Please enter a non$-$negative number."$)$

else:

return value

except ValueError:

print$("$Invalid input. Please enter a valid number."$)$

def calculate$\_$momentum$()$:

$"""$Function to calculate and display the momentum of an object."""

# Input from user

mass $=$ get$\_$positive$\_$float$("$Enter the mass of the object $($in kilograms$)$: $")$

velocity $=$ get$\_$positive$\_$float$("$Enter the velocity of the object $($in meters per second$)$: $")$

# Calculate momentum

momentum $=$ mass $*$ velocity

# Output the results

print$($f$"$The momentum of the object is: $\{$momentum:$\mathrm{.}2$f$\}$ kg$$m$/$s$")$

# Run the function to calculate momentum

if $\_\_$name$\_\_=="\_\_$main$\_\_"$:

calculate$\_$momentum$()$