#ifndef ROCKETH
#define ROCKETH

class rocket {
	double _length;   //in meters
	double _v;        //velocity in meters per second
public:
	rocket(double initial_length, double initial_v)
		: _length(initial_length), _v(initial_v) {}

	virtual ~rocket() {}

	virtual double length() const {return _length;}
	double v() const {return _v;}
};
#endif