Q

When an object is in free fall near the Earth's surface, which of the following physical quantities remains constant if air resistance is neglected?

RRB JE 19/02/2026 / 4:30 PM - 6:00 PM 2026
✓ Answer: C Acceleration due to gravity remains constant.
For free fall from rest, v² = u² + 2gh. With u = 0, g = 10 m/s² and h = 20 m, v² = 400, so v = 20 m/s.
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