then it will be going in the same direction forever
Because according to newtons 1st law "An object at rest stays at rest an a object in motion stays in motion" so in that case the baseball would continue going the same speed for forever because no friction would be there to stop it.
force of hand accelerate brick
the same force accelerates 2 bricks 1/2 as much
If you use the same force to push a truck and push a car, the car will have more acceleration than the truck, because the car has less mass.
when they push on each other with the same amount of force they does not moves that's newtons third law.