A rocket was launched From the surface of the earth vertically as it accelerates due to the action of its engines. At t$=15$sec the fuel ran out and the engines stopped. From then on the rocket continued its free fall movement to the surface of the earth. g$=10$m$/$sec$^2.$

The velocity time graph is presented below.

A$.$ Calculate the maximum velocity of the rocket at the max point shown on graph.

B$.$ What was the rockets acceleration when the engines worked.

C$.$ How long did it take from the start of the launch for the rocket to reach maximum height

D$.$ To what maximum height did the rocket get?

eurent rate moss norpancen exauert nroca recerer cnrwca. (s/w)a 15 100 t(s)