from vpython import *

# Create a 3D scene
scene = canvas()

# Set the floor
floor = box(pos=vector(0, 0, 0), size=vector(10, 0.1, 10), color=color.green)

# Create a bouncing ball
ball = sphere(pos=vector(0, 5, 0), radius=1, color=color.blue)
ball.velocity = vector(0, -1, 0)  # Initial velocity

# Set the gravity
gravity = vector(0, -9.8, 0)  # Acceleration due to gravity

# Time step for the animation loop
dt = 0.01

damping_factor = 0.85  # Adjust this value to control damping

# Animation loop
while ball.velocity != vector(0, 0, 0):
    rate(100)  # Limit the loop rate to ensure smooth animation
    
    # Update the ball's position
    ball.pos += ball.velocity * dt
    
    # Check for collisions with the floor
    if ball.pos.y < ball.radius:
        ball.velocity.y = abs(ball.velocity.y) * damping_factor  # Reverse the y-component of velocity with damping
    else:
        ball.velocity.y += gravity.y * dt

import React from 'react';
import { shallow, configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

configure({ adapter: new Adapter() });

import HelloWorld from './app';

var TestResult = function() {
    this.succeeded = false;
    this.reason = "";
    this.input = "";
    this.expected_output = "";
    this.actual_output = "";
}

export const executeTests = function() {

  var results = [];

  result = new TestResult();
  result.input = 'HelloWorld Component';
  result.expected_output = "span containing text 'Hello World'"

  let wrapper = shallow(<HelloWorld />);

  // Call your Challenge function here.

  let type = wrapper.type();
  let testSuccessful = true;
  let failureReason;

  if (type !== 'span') {
    testSuccessful = false;
    failureReason = "You need to render exactly one span HTML element";
  } else if (wrapper.props().children != "Hello World") {
     testSuccessful = false;
     failureReason = "You have rendered wrong message in your span element";
  }

  result.actual_output = wrapper.html();

  if (testSuccessful) {
    result.succeeded = true;
    result.reason = "Succeeded"
  } else {
    result.succeeded = false;
    result.reason = failureReason;
  }

  results.push(result);

  return results;
}


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Bouncing ball simulation in VPython

A bouncing ball loses height with each bounce due to friction and inelastic collisions, modeled using damped oscillation in VPython with step-by-step coding guidance.

Bouncing ball simulation in VPython

Physics behind bouncing ball

Code execution

Example code

Code explanation

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