Answer to Question #15251 in Electric Circuits for Chad
V = at,
where V is velocity, a is acceleration and t is the time of acceleration. Also we know that
L = at²/2 ==> a = 2L/t²,
where L is the stop distance. So, the initial speed of a car was
V = at = (2L/t²)*t = 2L/t = 2*13.7[m]/4.00[s] = 6.85 m/s.
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