Mathematics trick

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If the velocity of an object is given by v(t) = 3t^2 - 6t, what is the acceleration at time t = 2 seconds?
a) 6 m/s^2
b) 12 m/s^2
c) -6 m/s^2
d) -12 m/s^2

What is the average of first 150 natural numbers?
(A) 70
(B) 70.5
(C) 75
(D) 75.5

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