D. the force is doubled and the object’s mass is halved? 18. ||| a man pulling an empty wagon causes it to accelerate at 1.4 m/s2. what will the acceleration be if he pulls with the same force when the wagon contains a child whose mass is three times that of the wagon?

10 points! will mark brainiest! in a heat engine if 1,000 j of heat enters the system and the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2,000 j 1: write the equation 2: list out your known variables 3: plug the numbers into the equations 4: solve 5: write your solution statement that includes initial energy and final energy added you so much!