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Lucy moves down the hall at 3.5 m/s. When he sees Luke coming, he slows down. After 4.0 s, he is moving at 2.1. m/s. What is his acceleratio
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Answer:
Acceleration, a = 0.35 m/s²
Explanation:
Given the following data;
Initial velocity, u = 3.5 m/s²
Final velocity, v = 2.1 m/s²
Time, t = 4 secs
To find the acceleration, we would use the first equation of motion;
V = u – at (the sign is negative because Lucy is slowing down).
Substituting into the formula, we have;
2.1 = 3.5 – a(4)
2.1 = 3.5 – 4a
4a = 3.5 – 2.1
4a = 1.4
a = 1.4/4
a = 0.35 m/s²