Ball thrown upward and another is dropped

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In summary, the main difference between a ball thrown upward and a ball dropped is the initial velocity. The height of a ball thrown upward decreases over time while the height of a ball dropped increases until reaching its maximum height. Factors such as initial velocity, angle, air resistance, and gravity affect the trajectory of both types of balls. The mass of the ball does not affect its motion, but both types of balls can have the same speed at the same height during their motion. The ball thrown upward will have a higher initial speed compared to the ball dropped.
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Pict
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A ball is thrown upward from the ground with a initial speed of 25 m/s; at the same instant, another ball is dropped from a building 15 m high. After how long will the balls be at the same height?

I'm not even sure how to start it so help!
 
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  • #2
Draw a picture, with the applied forces.
 
  • #3
First, consider just one ball.
Can you determine its motion as a function of time?
 
  • #4
I'm not sure what formula to use to determine the time and I drew a pic but it didn't really help.
 

1. What is the difference between a ball thrown upward and a ball dropped?

The main difference between a ball thrown upward and a ball dropped is the initial velocity. When a ball is thrown upward, it has an initial velocity in the positive direction, while a ball dropped has an initial velocity of 0.

2. How does the height of the ball change over time for a ball thrown upward and a ball dropped?

The height of a ball thrown upward decreases over time until it reaches its maximum height, then it starts to fall back down. The height of a ball dropped increases until it reaches its maximum height and then it starts to fall back down.

3. What factors affect the trajectory of a ball thrown upward or dropped?

The trajectory of a ball thrown upward or dropped is affected by the initial velocity, the angle at which it is thrown or dropped, air resistance, and gravity.

4. How does the mass of the ball affect its motion when thrown upward or dropped?

The mass of the ball does not affect its motion when thrown upward or dropped. Both balls will follow the same trajectory, regardless of their masses, as long as all other factors remain constant.

5. Can a ball thrown upward and a ball dropped have the same speed at any point during their motion?

Yes, a ball thrown upward and a ball dropped can have the same speed at the same height during their motion. However, the ball thrown upward will have a higher speed when it is initially thrown compared to the ball dropped.

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