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10.A block of mass m is dropped from rest from the fourth floor of an office building, subsequently hitting the sidewalk at speed v. From

10.A block of mass m is dropped from rest from the fourth floor of an office building, subsequently hitting the sidewalk at speed v. From what floor should the mass be dropped to double that impact speed? (The ground floor is “floor zero”. The first floor is one floor above ground level.)
(a)The sixth floor
(b)The eighth floor
(c)The sixteenth floor
(d)The tenth floor

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