Calculate the instantaneous speed for an object that falls from rest for
8 seconds.
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What is its instantaneous speed? a = 10 m/s2, t = 8 s, v = ? v = at = (10 m/s2)(8 s) = 80 m/s.
How far has it fallen? a = 10 m/s2, t = 8 s, d = ? = 0.5(10 m/s2)(8 s)2 = 320 m. Or, = 0.5(80 m/s)(8 s) = 320 m.
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