Four balls are thrown off the top of a building 27 m high.All balls are thrown with identical speeds,but at different angles.Ball 1 is thrown straight upward.Ball 2 is thrown straight downward.Ball 3 is thrown at an angle of +45 $\circ$ relative to the horizontal.And Ball 4 is thrown at an angle of -45 $\circ$ relative to the horizontal.Which ball has the highest speed when it hits the ground?

Question

Quizplus · Accepted Answer

All of the balls will hit the ground at the same speed, regardless of the angle at which they were thrown or whether they were thrown upward or downward. This is because the only force acting on the balls once they leave the thrower's hand is gravity, which pulls all objects with the same acceleration (9.8 m/s^2) toward the center of the Earth. Therefore, the answer is E, "All hit with the same speed."

Four Balls Are Thrown Off the Top of a Building ∘\circ∘

Four Balls Are Thrown Off the Top of a Building $\circ$