65) This question asks us to describe the resulting motion of the ball if the bus accelerates when the ball is thrown upward. In order to thoroughly understand the problem, let's first look at what happens when the bus is traveling at a constant speed.
When the ball is thrown directly upward. It will travel with the system and will sustain the same speed as the bus.
Here's an example to prove that this will happen. Imagine we are traveling in an airplane at a steady 500 miles per hour. If you jump straight up, you will move with the system. You don't need to jump forward with a speed of 500 miles per hour to keep up with the airplane!
In the problem we are given, the bus is acceleration. This becomes a bit trickier because the bus is accelerating. Let's assume the bus is at rest.
If you throw the ball upward, the ball will land in the same place as we discussed. Now, let's assume the ball is in the air, and the bus starts to move.
The ball will land in the same place relative to the ground; however, the bus will move forward. This means the ball will land behind the thrower.
Answer: C
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