Taqiuddin MA, Shaharudin NMR, Yaakob O. Investigation of The Value of Spring Constant and Mass on The Efficiency of Moving Mass Devices. IJEEPSE [Internet]. 2022Jun.30 [cited 2024Nov.23];5(2):50-4. Available from: https://ijeepse.id/journal/index.php/ijeepse/article/view/107