Please choose the correct answer to the question: A student is standing on a skateboard that is not moving. The total mass of the student and the skateboard is 50 kilograms. The student throws a ball with a mass of 2 kilograms forward at 5 m/s. Assuming the skateboard wheels are frictionless, how will the student and the skateboard move?

Answer1: forward at 0.4 m/s Answer2: forward at 5 m/s Answer3: backward at 0.2 m/s Answer4: backward at 5 m/s

Answer format: answer1/answer2/answer3/answer4