ขนาดวิดีโอ: 1280 X 720853 X 480640 X 360
แสดงแผงควบคุมโปรแกรมเล่น
เล่นอัตโนมัติ
เล่นใหม่
33:17 Isn't it the spring force is in oppesite direction? Because current length of the spring is less than the unstrecthed length of the spring.
33:17 Isn't it the spring force is in oppesite direction? Because current length of the spring is less than the unstrecthed length of the spring.