What is the velocity of the firework after 5 seconds ?

Question

the position of a firework as it flies is given by the function s(t(=10+50t-0.8t^2

Answer 1

s(t) = 10 + 50t - 0.8t²

 

v = ds/dt = 50 - 1.6t

 

v(5) = 50 - 1.6(5) = 42 distance units per second

 

Note:  No distance units were given in the problem statement.