Sakena yacoobi was born in afghanistan and educated in the united states. she started working with the international rescue committee (irc) in pakistan during the mid-1990s. "when you see the joy and excitement in the students' faces, when you see them sitting on dirt floors, under trees, and in dark basements-anywhere to get an education, you forget all your troubles," yacoobi has said of her work.

Afaulty model rocket moves in the xy-plane (the positive y direction is vertically upward). the rocket's acceleration has components ax(t) = ? t2 and ay(t) = ? ? ? t, where ? = 2.50 m/s4 , ? = 9.00 m/s2 , and ? = 1.40 m/s3 . at t = 0 the rocket is at the origin and has velocity ~v0 = v0x ? i + v0y ? j with v0x = 1.00 m/s and v0y = 7.00 m/s. (a) calculate the velocity and position vectors as functions of time. (b) what is the maximum height reached by the rocket? (c) sketch the path of the rocket. (d) what is the horizontal displacement of the rocket when it returns to y = 0?