Physics: vertical motion and velocity/kinematics

In summary, the question is asking for the downward (vertical) component velocity at the moment the ball "strikes the ground".
  • #1
YMMMA
156
10

Homework Statement


In the attached file

Homework Equations


Kinematics equations.

The Attempt at a Solution


The question asks about vertical component. Isn’t this always 0? Like in C the intial velocity is the horizontal velocity but the vertical one is 0. Same applies to all. Am I correct?
 

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  • #2
YMMMA said:
The question asks about vertical component.
...at the point of impact with the ground.

Isn’t this always 0?
No.
in C the initial velocity is the horizontal velocity but the vertical one is 0.
Yes.
Same applies to all. Am I correct?
No.
 
  • #3
lewando said:
...at the point of impact with the ground.No.

Yes.

No.
Could not understand ‘ at the point of impact with the ground ‘

And why E is wrong?
 
  • #4
When you throw a ball off a tower it will eventually "hit the ground". The question is directly asking for the downward (vertical) component velocity at the moment the ball "strikes the ground". To be even more clear, this "moment" is actually the time right before the ball starts interacting with the ground.
 
  • #5
lewando said:
When you throw a ball off a tower it will eventually "hit the ground". The question is directly asking for the downward (vertical) component velocity at the moment the ball "strikes the ground". To be even more clear, this "moment" is actually the time right before the ball starts interacting with the ground.
Final velocity, then?
 
  • #6
Yes final velocity--at the time right before the ball begins to interact with the ground.
 
  • #7
lewando said:
Yes final velocity--at the time right before the ball begins to interact with the ground.

Should I use the equation Vf=Vi+gt? Where Vi is 0 in C, but how should I check the other choices
 
  • #8
YMMMA said:
Should I use the equation Vf=Vi+gt? Where Vi is 0 in C, but how should I check the other choices
This is more of a concept question, you should be able to arrive at an answer by thinking about it. So try thinking about it. And if you want to verify your thought process, go ahead and assign a tower height and specific values for initial velocity components see what results you get.

By the way, in post #5, that should be "final vertical velocity"
 
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  • #9
lewando said:
This is more of a concept question, you should be able to arrive at an answer by thinking about it. So try thinking about it. And if you want to verify your thought process, go ahead and assign a tower height and specific values for initial velocity components see what results you get.

By the way, in post #5, that should be "final vertical velocity"
Okay, thank you!
 

Related to Physics: vertical motion and velocity/kinematics

1. What is vertical motion in physics?

Vertical motion in physics refers to the movement of an object along a vertical axis, such as up and down. It is often described using the concepts of velocity, acceleration, and displacement.

2. How is velocity related to vertical motion?

Velocity in vertical motion is the rate of change of an object's position in the vertical direction. It is typically measured in meters per second (m/s) and can be positive (moving upwards) or negative (moving downwards).

3. What is the difference between speed and velocity in vertical motion?

Speed is the rate of change of distance traveled, while velocity is the rate of change of displacement. This means that velocity takes into account the direction of motion, while speed does not. In vertical motion, speed and velocity can be the same if the object is only moving up or down.

4. How is acceleration calculated in vertical motion?

Acceleration in vertical motion is calculated by dividing the change in velocity by the change in time. It is typically measured in meters per second squared (m/s^2) and can be positive (increasing velocity) or negative (decreasing velocity).

5. What is the equation for displacement in vertical motion?

The equation for displacement in vertical motion is:
Δy = v0t + ½at^2
Where Δy is the displacement, v0 is the initial velocity, t is the time, and a is the acceleration. This equation assumes constant acceleration and can be used to calculate the displacement of an object during vertical motion.

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