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vi = 22 m/s
vf = 3 m/s
a = - 2,1 m/s²
t = ?
Calculamos tiempo.
t = (vf - vi)/a
t = (3 m/s - 22 m/s)/ - 2,1 m/s²
t = /- 19 /s)/ - 2,1 /s²
t = 9,05 s
Opción b)