1. Consider a block sliding on a frictionless loop-the-loop track of radius R shown in the figure. Find the minimum height H at which the block starts from rest and still contacts the track when it passes the highest point of the track (point A).
(A) 0.5 R
(B) R
(C) 1.5 R
(D) 2 R
(E) 2.5 R
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