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a)
v₁ --> t = 1s
v₁ = 3.1²-(2.1)+5
= 3-2+5
= 6 m/s
v₂ --> t = 5s
v₂ = 3.5²-(2.5)+5
= 75 -10+5
= 70 m/s
b) a ---> t = 0
a = dv/dt
= 6t-2
= 6(0) - 2
= -2 m/s²