What would you expect to happen to the acceleration if all friction were removed from the ramp, making the net force even higher than 600 n?

if all friction was removed the object would accelerate at increasingly higher speeds, if the net force goes above 600 N you would need something pretty heavy to stop it or something going the opposite direction going the same speed to collide into it causing them both to go to 0 N

Explanation:

so easy. just google the electromagnetic waves and it’ll pop up.