Question

An aircraft decelerates at 0.5m/s. After 8 minutes it dropped to 160m/s. Find its initial velocity.
v =Vi + a t
v= 160
t = 8*60 = 480 s
a = -0.5 m/s^2 (I assume you mean)
160 = Vi - 0.5 *480
Vi = 160 + 240 = 400 m/s

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