Need Help Which of the following correctly compares a pure substance to a mixture?

A. A pure substance can only be separated by physical means, whereas some mixtures can be separated by chemical means.

B. A pure substance can only be separated by chemical means, whereas some mixtures can be separated by physical means.

C. Both pure substances and mixtures can be separated by physical means.

D. Both pure substances and mixtures can be separated by chemical means.

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?