Assertion: hailstone | /r/CapableOf | fall at a rate of 9 metres per second
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Source sentences:
text: It is estimated that a hailstone of 1 centimetre (0.39 in) in diameter falls at a rate of 9 metres per second (20 mph), while stones the size of 8 centimetres (3.1 in) in diameter fall at a rate of 48 metres per second (110 mph).