gistfile1.txt

public float pram;

void OnCollisionEnter(Collision collision){
		if (collision.gameObject.tag == "Player") {
			//弾の速度を取得
			Vector3 v = rigidbody.velocity;
			Debug.Log (v);
			
			//加力
			float x = v.x * pram;
			float y = v.y * pram;
			float z = v.z * pram;
            
            //ぶつかったオブジェクトに力を加える
			collision.gameObject.rigidbody.AddForce (x, y, z);

		}
	}