- For question 42 and 43. How to calculate the answer?

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If a rock is thrown into the air with a velocity of 21 m/s, t seconds is given by y=21t−4.9t^2.
Find the velocity when t=1.9.? What is the difference between homogenous and heterogeneous mixtures? Given a vector with the initial point, (3,1) and the terminal point, (-4,2), find unit vector form? Calculus Problem Help? Two vectors beginning at the same vertex of a triangle are 〈-5,3〉 and 〈3,5〉. Choose the correct classification of the triangle?