m= 1,512 kg
vo = 72 km/h = 20 m/s
v= 0
t= 12 s
a = ?
v=vo+a.t
0 = 20 + a.12
-20 =12.a
a = -5/3 m/s²
Fr= m.a
Fr = 1,512.(-5/3)
Fr= - 2,52 N >>>> em módulo Fr= 2,52 N
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m= 1,512 kg
vo = 72 km/h = 20 m/s
v= 0
t= 12 s
a = ?
v=vo+a.t
0 = 20 + a.12
-20 =12.a
a = -5/3 m/s²
Fr= m.a
Fr = 1,512.(-5/3)
Fr= - 2,52 N >>>> em módulo Fr= 2,52 N