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The relevant equations are
d=1/2 at2 and
v = at.
Substituting t = v/a into d=1/2 at2 gives
d = v2/2a.
This formula will give the drop height d for any desired speed v.
Plugging in
v = 20mph = 8.9408m/s;
a = 9.8 m/s2 (this is the gravitational acceleration at the earth's surface)
we get
d = 4.078m = 13.38 feet.
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