Hello, So I know F = ma. If a particle is moving at constant velocity and strikes something, doesn't that mean there will be zero force, beacuse there is no acceleration? I'm having a hard time conceptualizing this, as it seems there would be a large force. For example, if a bullet could somehow travel at a constant velocity, how would there be no force upon striking something? When is it possible for something with mass to have zero acceleration? Thank you.