Question 263115
avg speed= .250 
How far in meters would the feather fall in 4 seconds if it were dropped in a vacuum at the Earth's surface? 
a. 1.00 b.9.80 c. 19.6 d. 39.2 e. 78.4 
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If its avg speed is .250, it will fall 1.0 in for seconds, assuming the units are per second.
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4.9 m/sec/sec is commonly used for gravitational acceleration on Earth.
s = 4.9*t^2 = 4.9*16
s = 78.4 meters