using System;
using Science.Mathematics;
using L=Science.Physics.GeneralPhysics;

namespace Serway.Chapter02
{
	/// <summary>
	/// Example05: Average and Instantaneous Acceleration
	/// The velocity of a particle moving along the x axis varies 
	/// in time according to the expression v_x = (40 - 5t^2) m/s, 
	/// where t is in seconds.
	/// (A) Find the average acceleration in the time 
	/// interval t = 0 to t = 2.0s
	/// (B) Determine the acceleration at t = 2.0 s.
	/// </summary>
	public class Example05
	{
		public Example05()
		{
		}
		private string result;
		public string Result
		{
			get{return result;}
		}
		public void Compute()
		{
			L.Time t = new L.Time();
			L.Vector.FunctionOfTime VelocityTime = new L.Vector.FunctionOfTime(Func);
			L.Velocity v1 = new L.Velocity();
            v1.VectorFunctionOfTime = VelocityTime;
			L.Velocity v2 = new L.Velocity();
            v2.VectorFunctionOfTime = VelocityTime;
					
			//(A)
			t.s = 0.0;
			v1.Set(t);
			result += Convert.ToString(v1.X)+"\r\n";
			t.s = 2.0;
			v2.Set(t);
			result += Convert.ToString(v2.X)+"\r\n";
			t.Interval = 2.0 - 0.0;
			L.Acceleration abar = new L.Acceleration(v2,v1,t);
			result += Convert.ToString(abar.X)+"\r\n";

			//(B)		
			L.Velocity v = new L.Velocity(VelocityTime);
			t.s = 2.0;
            L.Acceleration a = new L.Acceleration(v,t);
			result += Convert.ToString(a.X);
		}
		private L.Vector Func(L.Time t)
		{
			L.Vector v = new L.Vector();
			v.X = 40.0 - 5.0*t.s*t.s;
			v.Y = 0.0;
			v.Z = 0.0;
			return v;
		}
	}
}