Adding velocity to a simple grenade model

Hello everyone. I am attempting to make a simple grenade, but I can’t seem to figure out how to move it. My grenade is a model, not a single part, so does anyone know a good way to add a velocity to the model without breaking the welds between parts?

Seems like you can still work with the new part physics api. Either apply impulse which is a force or assembly linear velocity should do the trick.