# [05AB1E], 8 bytes

    ô0ζO²Å0+

[Try it online!][TIO-j7rkb6vq]

[05AB1E]: https://github.com/Adriandmen/05AB1E
[TIO-j7rkb6vq]: https://tio.run/##MzBNTDJM/f//8BaDc9v8D2063Gqg/f9/tKGOglEslzEA "05AB1E – Try It Online"

    ô0ζO²Å0+   Full program
    ô          Push <1st input> split into a list of <2nd input> pieces
     0ζ        Zip sublists with 0 as a filler
       O       Sum each sublist
               --- from here, the program handles outputs shorter 
                   than the required length
        ²Å0    Push a list of zeros of length <2nd input>
           +   Sum the result with that list