Answer:
The speed of the shell at launch and 5.4 s after the launch is 13.38 m/s it is moving towards the Earth.
Explanation:
Let u is the initial speed of the launch. Using first equation of motion as :
[tex]u=v-at[/tex]
a=-g
[tex]u=v+gt\\\\u=17+9.8\times 2.3\\\\u=39.54\ m/s[/tex]
The velocity of the shell at launch and 5.4 s after the launch is given by :
[tex]v=u-gt\\\\v=39.54-9.8\times 5.4\\\\v=-13.38\ m/s[/tex]
So, the speed of the shell at launch and 5.4 s after the launch is 13.38 m/s it is moving towards the Earth.
