#include "physics.h"



// implementation of physics class

// created 3/18/98





Physics::Physics()

// initialize velocity and distance to zero

{

	velocity=0;

	distance=0;

}



float Physics::accelerate(int time)

//Calculates the distance traveled after time seconds

//Returns the distance traveled and updates the velocity and distance 

//Assumes that acceleration is 1/7200 miles per second squared

{

	float deltadistance;

	deltadistance=1/14400.0*time*time+velocity*time;

	velocity=velocity+1/7200.0*time;

	distance=distance+deltadistance;

	return(deltadistance);

}



float Physics::decelerate(int time)

//Calculates the distance traveled after time seconds

//Returns the distance traveled and updates the velocity and distance 

//Assumes that acceleration is -1/7200 miles per second squared

{

	float deltadistance;

	deltadistance=-1/14400.0*time*time+velocity*time;

	velocity=velocity-1/7200.0*time;

	distance=distance+deltadistance;

	return(deltadistance);

}