Projectile motion of a flying object

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Homework Help Overview

The discussion revolves around a projectile motion problem involving an object thrown horizontally off a cliff with a specified initial speed. Participants are exploring the implications of the horizontal throw and its effects on velocity over time.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants express uncertainty about how to approach the problem without an angle and question the meaning of "horizontally." Some suggest looking up definitions to clarify the concept.

Discussion Status

The discussion is ongoing, with participants seeking to clarify the definition of horizontal motion and its implications for the problem. Some guidance has been offered regarding the interpretation of horizontal velocity, but no consensus has been reached on how to proceed with the calculations.

Contextual Notes

Participants note a lack of familiarity with equations relevant to projectile motion and express confusion regarding the initial conditions of the problem.

rrosa522
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Homework Statement


an object is thrown horizontally off a cliff with an initial speed of 7.5m/s. The object strikes the ground 3 sec later
what is the horizontal velocity after 1.5 sec

Homework Equations

The Attempt at a Solution


i don't know how to start this problem without an angle given
 
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rrosa522 said:

Homework Statement


an object is thrown horizontally off a cliff with an initial speed of 7.5m/s. The object strikes the ground 3 sec later
what is the horizontal velocity after 1.5 sec

Homework Equations

The Attempt at a Solution


i don't know how to start this problem without an angle given

What does 'horizontally' mean to you?
 
rrosa522 said:

Homework Statement


an object is thrown horizontally off a cliff with an initial speed of 7.5m/s. The object strikes the ground 3 sec later
what is the horizontal velocity after 1.5 sec

Homework Equations

The Attempt at a Solution


i don't know how to
SteamKing said:
What does 'horizontally' mean to you?
im not really sure what it is, I don't know any equations to solve this problem,
 
rrosa522 said:
im not really sure what it is, I don't know any equations to solve this problem,
Well, if you have a dictionary you could look up the definition of 'horizontally'. You can probably find some dictionaries online if you are diligent.

(Hint: 'horizontally' and 'vertically' are often used in these types of projectile problems. You should become familiar with their definitions.)
 
SteamKing said:
Well, if you have a dictionary you could look up the definition of 'horizontally'. You can probably find some dictionaries online if you are diligent.

(Hint: 'horizontally' and 'vertically' are often used in these types of projectile problems. You should become familiar with their definitions.)
i think it is the same as the initial speed given so 7.5m/s, is that right?
 
rrosa522 said:
i think it is the same as the initial speed given so 7.5m/s, is that right?

The initial speed is the initial speed, no more, no less.

You were originally looking for the initial angle at which the projectile was thrown. Knowing the definition of 'horizontally' provides that angle, no more, no less.
 
Hi rosa. A ball is thrown horizontally--- this means the ball is thrown at an angle of 0 deg. with the X-axis.
55.png

What are the forces acting on the ball in X-direction (or horizontal direction)? What is the acceleration of the ball in horizontal direction?
 

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