All I need is the letter of the correct answer. 27) When a constant unbalanced force acts on an object in the direction of its motion, the object’s speed A) decreases; B) increases; C) increases then decreases; D) decreases then increases. 29. A cart of mass m traveling at speed v has a kinetic energy KE. If the mass of the cart is halved and its speed is doubled, the kinetic energy of the cart will be A) half as great; B) twice as great; C) one-fourth as great; D) four times as great. 30. Four identical resistors of resistance 5R each are connected in parallel. What is the total resistance of all resistors? A) 0.8R B) 1.25R C) 5R D) 20R

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”