7) - An object accelerates (changes its speed) only if the forces acting on it in one direction are greater than the forces in the opposite direction, All of the following objects will accelerate EXCEPT?
A) a ball striking a wall, in which the force of the ball on the wall is equal to the force of the wall on the ball
B) a gas balloon in which the buoyant force is greater than its weight and air resistance
C) a man in a parachute when the air resistance is less than his weight
D) an airplane in horizontal flight when the thrust of the engine is equal to the drag of the air
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That is a really badly crafted question. D has thrust equal to drag, so it is in zero acceleartion (horizontally). A is a confusing answer. If both forces are equal, then the ball continues to move through the wall (What would stop it?)
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To determine which of the objects will not accelerate, we need to examine the forces acting on each of them.
A) In the case of a ball striking a wall, if the force of the ball on the wall is equal to the force of the wall on the ball, there will be no net force acting on the ball. Therefore, it will not accelerate. So, option A is correct.
B) In the case of a gas balloon, if the buoyant force (which is the force exerted by the gas inside the balloon) is greater than its weight and air resistance, there will be a net upward force. This will cause the balloon to accelerate upwards, so it will accelerate. Therefore, option B is incorrect.
C) In the case of a man in a parachute, if the air resistance is less than his weight, there will be a net downward force acting on the man. This will cause him to accelerate downwards, so he will accelerate. Therefore, option C is incorrect.
D) In the case of an airplane in horizontal flight, if the thrust of the engine is equal to the drag of the air, there will be no net force acting on the airplane. Therefore, it will not accelerate. So, option D is correct.
So, based on the analysis, the correct answer is A) a ball striking a wall, in which the force of the ball on the wall is equal to the force of the wall on the ball.