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Problem 3.21 A certain object is losing mass at a rate ê (kg/s). It is acted upon by a constant force F. (a)
0, the mass is mo
Determine its acceleration and its position as a function of time. Assume that at t
the velocity is zero and the object is at x = : 0. (b) Show that as K → 0, the expression for x (t) reduces to
F
X =
= ½ (6) 1²2, that is, x
=
= 1at².

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