Question

A web page designer creates an animation in which a dot on a computer screen has position

r⃗ =[4.0cm+(2.5cm/s2)t2]ı^+(5.0cm/s)tȷ^$$\overrightarrow{r}=\left[4.0\mathrm{c}\mathrm{m}+\left(2.5\mathrm{c}\mathrm{m}/{\mathrm{s}}^2\right)t^2\right]\hat{ı}+(5.0\mathrm{c}\mathrm{m}/s)t\hat{ȷ}$$

. (a) Find the magnitude and direction of the dot’s average velocity between t = 0 and t = 2.0 s.(b) Find the magnitude and direction of the instantaneous velocity at t = 0, t = 1.0 s, and t = 2.0 s. (c)Find the mangnitude and instantaneous acceleration at t=0,t=1.0s and t=2.0.s