Calculus help- velocity and displacement (1 Viewer)

[CopperPike]

Hey guys, could someone explain question c, the image is attached:


This is its solution:


I got up to the 2nd last line, don't know how to get the last line though.

Thanks for any help!

 

[tickboom]

Is it just multiplying everything in the 2nd last line by e^t ... ?

 

[CopperPike]

Yeah that’s it, I see it now.
Thanks for the help!