Can someone explain this s*it. Light, or in other words photons have no mass. That's why they're able to move at the speed of light because mass could never move that fast.

But if a massless object bumps into something it doesn't exert a force because for that you would need mass. Without mass you have no momentum and no kinetic energy. And yet a solar sail is a thing that apparently works by photons pushing it forward like wind pushing onto the sail of a sailboat. How is that possible?