3. The position of a particle moving along the x-axis is given by x = 7t^2 + 2t^3, where x is in meters and t is in seconds. Determine the following, when t = 1.4 s:
(a) The position (2) (b) The velocity (2) (c) The acceleration (2)
a)
"x=7t^2+2t^3,"
"x(1.4)=19.2~m,"
b)
"v=\\dot x=14t+6t^2,"
"v(1.4)=31.4~\\frac ms,"
c)
"a=\\dot v=14+12t,"
"a(1.4)=30.8~\\frac m{s^2}."
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