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## Homework Statement

Suppose that the position vector for a particle is given as a function of time by (t) = x(t) + y(t), with x(t) = at + b and y(t) = ct2 + d,where a = 1.70 m/s, b = 1.20 m, c = 0.122 m/s2, and d = 1.18 m.

(a) Calculate the average velocity during the time interval from t = 2.05 s to t = 4.05 s.

(b)Determine the velocity at t = 2.05 s.

(c)Determine the speed at t = 2.05 s.

## Homework Equations

for a.) I used

_{Vavg}=delta r/delta t

## The Attempt at a Solution

for a.) for rf i got x(t)=8.05

y(t)=3.181

for ri i got x(t)=4.685

y(t)=1.69

and delta t=4.05-2.05=2

Im not getting it. Someone please help

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