Solving a Ball Thrown off a Cliff: How Long Does it Take?

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Homework Help Overview

The problem involves a ball thrown from a cliff at a specific angle and speed, with the goal of determining the time it takes for the ball to strike the ground and the height of the cliff. The subject area pertains to projectile motion in physics.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to calculate the time of flight using horizontal motion and expresses confusion about the next steps. Some participants suggest focusing on vertical motion equations to find the height of the cliff.

Discussion Status

The discussion is ongoing, with participants providing feedback on the clarity of visual aids and encouraging the original poster to clarify the vertical motion equations. There is an indication of productive direction as participants engage with the problem's components.

Contextual Notes

There are mentions of issues with the clarity of images provided, which may affect the understanding of the problem setup. The original poster has acknowledged these issues and attempted to improve the visual representation.

NotInMrPutmansClass
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Homework Statement
Find the height of a cliff using a ball thrown at an angle and find how long it takes the ball to hit the ground.
Relevant Equations
a-sinA, aCosA
This is the question:
A ball is thrown with a speed of 6m/s at an angle of 25° above the horizontal from the top of a cliff. The ball strikes the ground 15 m from the bottom of the cliff.

How long does it take the ball to strike the ground?

How long is the cliff?Here's a visual representation of the problem.
Kinematics 1.jpg

I broke the angle into vectors
Kinematics 2.jpg


I solved for the time of the ball in the
x-axis

t=d/v
t=15m / 5.4378m/s
t = 2.7584 Seconds

But now I'm stuck and I'm lost on what to do next
 
Last edited:
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Welcome to PF.

I'm not able to see much in your attached images -- I seem to only be seeing thumbnail-size images and they are not well lit. Could you maybe use a printer/scanner to generate better copies?
 
NotInMrPutmansClass said:
But now I'm stuck and I'm lost on what to do next
After you post legible figures, you should write the appropriate equation(s) for the motion in the vertical direction.
 
berkeman said:
Welcome to PF.

I'm not able to see much in your attached images -- I seem to only be seeing thumbnail-size images and they are not well lit. Could you maybe use a printer/scanner to generate better copies?
I reposted the pictures and they seem to be fine now.
 
NotInMrPutmansClass said:
I reposted the pictures and they seem to be fine now.
What's the problem with getting the height of the cliff, now you have the time of flight?
 

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