Asked by lisa

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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Answered by bobpursley
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?)
Answered by Brittany
WHERE CAN I GET EXACT INFO OR EXTRA HELP FOR MY PROJECT..
WE HAVE TO HAVE A QUESTION TO ASK OURSELF AND I CHOSE DOES MASS AFFECT WEIGHT?
I NEED HELP ON THAT.
I HAVE TO DO A TRIFOLD WITH PICTURES,GRAPHS AND THE WHOLE 9 YARDz.
YOUR HELP WILL MEAN MUCH TO ME.
THANKS
Answered by Brittany
I have no idea..lol
I need help..
this project is due monday
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