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.
for a.) I used Vavg=delta r/delta t
The Attempt at a Solution
for a.) for rf i got x(t)=8.05
for ri i got x(t)=4.685
and delta t=4.05-2.05=2
Im not getting it. Someone please help