Answer:
Acceleration:
a = 1 km/c²
Step-by-step explanation:
Given:
V1 = 21 km/h
V2 = 9 km/h
Δt =13 s
________________
a - ?
a =(V2 - V1) / Δt = (21 - 9 ) /13 = 12 /13 ≈ 1 km/c²
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