A particle moves along the x-axis so that at any time t, measured in seconds, its position is given by s(t) = 4sin(t) - cos(2t), measured in feet. What is the acceleration of the particle at time t = 0 seconds?

Answer 1

s" = -4sin(t) + 4cos(2t)

maybe you can at least supply the units, eh?

Answer 2

I think it is -1

Answer 3

I got -1

Answer 4

huh. I guess you don't like my formula. What did you use?