Please choose the correct answer to the question: What can cause a moving object to increase its speed in a forward direction?

Answer1: a force pushing on the object from the opposite direction Answer2: a force that continually acts on the object in the direction the object is moving Answer3: an increase in the mass of the object Answer4: a decrease in the mass of the object

Answer format: answer1/answer2/answer3/answer4
Answer: answer2