Questions in free fall

In summary, the conversation discusses a problem involving a small steel ball being launched vertically from the top of a building with an initial velocity of 18 m/s. The questions revolve around the time it takes for the ball to reach the ground and the total time it is in motion, as well as the difference between the two. The answers provided include the time it takes for the ball to reach the top of its path, its final velocity, the total time in motion, and the height it reaches above the building. The speaker also advises against solely relying on the given answers and encourages understanding the process of solving the problem.
  • #1
manal950
177
0
A small steel ball is hot vertically upward from vertically upward from the top of a building 25 above the ground with an initial velocity of 18 m/s .
1 ) In what time it will reach the ground ?
2 ) compute the velocity with which it will strike the ground and the total time it is in the motion

please I want know What is the difference between time it will reach the ground and total time

Is same or what
 
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  • #2
They look like the same in these questions.
 
  • #3
but I have the answer for this Q :

t = 1.83 s
V 28.5
t2 = 2.9 s
total = 4.7s

now what is the difference between t and total
 
  • #4
The 1.83 is the time that this ball takes to reach the top of its path.
Is that what the book gives as the answer to part a?
 
  • #5
This is full Q
A small steel ball is hot vertically upward from vertically upward from the top of a building 25 above the ground with an initial velocity of 18 m/s .
1 ) In what time it will reach the ground ?
2) how high above the building with the ball rise
2 ) compute the velocity with which it will strike the ground and the total time it is in the motion and the answer
t1 = 183
h1 = 16.52
v = 28.5
t2 = 2.9
Total time = 4.37
 
  • #6
You should try to answer the question.
After getting your answer, then only you compare with the answer given.

You shouldn't looking at the answer first and try to reverse the process.
Everybody makes mistakes. Thats how we learn. Don't try to prove the answers in the book. They are nearly all correct, except maybe typo.
 
  • #7
Hi I know how to solve this Q but there is confusing at some point
 
  • #8
You know the answers but not the workings.
 
  • #9
Their t1 is the time it takes for the ball to reach h1.

So it's possible that the question was reworded at some point and the answer wasn't changed.
 

1. What is free fall?

Free fall is the motion of an object under the sole influence of gravity. This means that the object is not experiencing any other forces, such as air resistance or friction.

2. How is free fall different from other types of motion?

Unlike other types of motion, free fall is solely determined by the force of gravity and not affected by other forces. This means that all objects in free fall, regardless of mass, will fall with the same acceleration.

3. What is the acceleration due to gravity in free fall?

The acceleration due to gravity in free fall is approximately 9.8 meters per second squared (m/s²) near the Earth's surface. However, this value can vary slightly depending on the location and altitude.

4. How is the velocity of an object in free fall affected by time?

In free fall, the velocity of an object increases by 9.8 m/s every second. This means that the longer an object falls, the faster it will be moving.

5. What is the position of an object in free fall at different time intervals?

The position of an object in free fall can be calculated using the equation d = 1/2gt², where d is the distance traveled, g is the acceleration due to gravity, and t is the time. This means that the position of an object will increase exponentially as time passes.

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