The r50 can do electronic shutter or second curtain shutter, but it doesn't have a global shutter or full mechanical shutter.
So, some ELI5 background on camera sensors. Most sensors read the data from the sensor pixel by pixel, line by line. So what that means is that a small amount of time passes between reading the top lines of the sensor and the bottom lines of the sensor. Most of the time, this doesn't make much difference. But for fast moving objects (or if you're panning the camera really fast) it means that the scene can change during that passage of time, which is what gives you trains that lean to one side and propellers that look like they're made of rubber.
To get around that, you can use a physical shutter. Cameras with "second curtain" shutters physically close off the light to the sensor before they start reading data from the sensor. This means that even though time passes between reading the top and the bottom of the line, the light captured by the sensor does not change during that time, and so the wobbly subjects don't happen.
A camera with a full mechanical shutter puts a physical shutter at the beginning of the process and the end, but the gains over second curtain only are negligible.
In theory, there is also "global shutter" which is a camera that reads the entire sensor at once, but in practice, this technology doesn't exist at the consumer mirrorless camera level.
Electronic shutters aren't all bad though, because they let you do faster shutter speeds than are possible with physical elements, and they let you do higher fps when shooting in burst mode. And electronic shutters are also silent