'गुरुत्वाकर्षण' (gravity) के कारण मुक्त पतन (free fall) में त्वरण:

उत्तर: (C) 9.8 m/s² — g=9.8 m/s² (≈10 m/s² for calculations). All objects fall with same acceleration regardless of mass (in vacuum). Galileo's Leaning Tower of Pisa experiment. g varies: less at poles/altitude, more at eq...