Physics, 13.10.2021 14:00, ayoismeisalex

A runner decreases his velocity from 20 m/s to 10 m/s in 2.0 s. What was his average acceleration?
a -5.0 m/s2
b 3.2 m/s2
C 8.0 m/s2
d 6.3 m/s2

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A runner decreases his velocity from 20 m/s to 10 m/s in 2.0 s. What was his average acceleration?...