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vi = 12 m/s
vf = 4 m/s
d = 32 m
a = ?
Calculamos aceleración.
vf² - vi² = 2ad
(4 m/s)² - (12 m/s)² = 2 (32 m) (a)
16 m²/s² - 144 m²/s² = 64 m (a)
- 128 m²/s² = 64 m (a)
(- 128 m²/s²) / (64 m) = a
- 2 m/s² = a
a = - 2 m/s²