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Acceleration = change in velocity/time

a = (v - u) /t

where a= acceleration, v= velocity, u= initial velocity & t= time.

u = 121 m/s

v = 98 m/s

t = 12 m/s

a = (98 - 121) /12

a = -23/12

a = -1.91667 m/s2

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