Note that you’ll add this impulse per-frame so if the frame-rate goes faster, it’ll add more, same for slower frame-rate. Also, physics by default doesn’t run per-frame unless you change it in the physics 2D settings, it runs during the fixed-update. There’s plenty of info about this online so I won’t go into it further here.
Also, so you know, here’s how to post code on the forums: Using code tags properly