given
x = 2t2 + 2t + 4
A)
position at t = 4 s
x = 2*(4)2 + 2*4 + 4
x = 44 m
B)
v = dx/dt
v = 4*t + 2
velocity at t = 4 s
v = 4*4 +2
v = 18 m/s
C)
a = dv/dt
a = 4
so acceleration at t = 4 s
a = 4 m/s2
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