A web page designer creates an animation in which a dot on a computer screen has a position of [tex]r^\rightarrow [4.40cm + (2.20cm/s^2)t^2]\underlinei + (5.00 cm/s)t\underlinej[/tex] okay i already have the correct answer, but i would like to know how the author got it. i came close to getting the correct answer. Question.) Find the instantaneous velocity at t=1.0. Give your answer as a pair of components separated by a comma(x,y). ok to find the instantaneous velocity, i need to find the derivative of the function... d/dt r = 2(2.20cm/s)*2(t)i + (5.00cm/s) plug in 1.0 for t and got.... (8.8cm/s,5.00cm/s) <--- my answer (4.40cm/s, 5.00 cm/s) <--- correct answer it looks like the correct answer divided my x-component by 2, but why? can someone explain?