Projectile Motion Help: Calculating Direction of a Ball Thrown from a Cliff

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Homework Help Overview

The problem involves a ball thrown horizontally from a cliff with a specified initial velocity and height, seeking to determine the direction of the ball just before it impacts the ground.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the need to find both vertical and horizontal components of the ball's velocity at impact, with references to trigonometric relationships for determining direction. There are attempts to apply kinematic equations to relate acceleration and velocity.

Discussion Status

The discussion is active, with participants exploring different aspects of the problem, including the effects of gravity on horizontal speed and the use of kinematic equations. Guidance has been offered regarding the relationship between the components of velocity and the application of trigonometry.

Contextual Notes

Participants express uncertainty about the angle of impact and the calculations involved, indicating a need for clarification on the concepts of projectile motion and the effects of gravity.

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Homework Statement


a ball is throwm horizontally from top of a cliff with velocity 10meter per second. height of cliff above the ground is 45 meters. calculate the direction of ball to horizontal surface just before it hits the grouND

The Attempt at a Solution

i found time=3s...and horizontal distance as 20m...but i cud not figure out ANYTHING ABT THE DIRECTION...PLZ HELP
 
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Do you know how to get the vertical and horizontal components of the ball's velocity right before it hits the ground? If so, you can directly use trigonometry to get the direction.
 
um i have tried a lot... can u please help me find the angle just before the angle hits the horizontal surface...m a learner...looking forward to ur cooperation
 
Gravity acts downwards, so it can't change the ball's horizontal speed. It's still 10 m/s on impact. As for vertical speed, can you find a kinematic equation that relates acceleration, distance traveled, initial speed, and final speed?
 
ideasrule said:
Gravity acts downwards, so it can't change the ball's horizontal speed. It's still 10 m/s on impact. As for vertical speed, can you find a kinematic equation that relates acceleration, distance traveled, initial speed, and final speed?

yes v²-u²=2as...where a is acceleration
u is initial velocity...s is distance...v is final velocity
 

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