Q

A ball at rest is dropped from the top of a 20 m high building. Calculate the speed with which it hits the ground. (Take g = 10 m/s²)

RRB JE 19/02/2026 / 4:30 PM - 6:00 PM 2026
✓ Answer: D 20 m/s
A concave mirror has its reflecting surface curved inward, toward the centre of curvature.
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