Calculating Projectile Motion and Speed: Vertical and Horizontal Components

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Homework Help Overview

The problem involves calculating the projectile motion of an object that must clear an 80m high obstacle at its maximum height. The subject area includes kinematics, specifically focusing on the vertical and horizontal components of motion.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to determine the vertical speed and time to reach maximum height, as well as the horizontal speed needed to cover a distance of 100m. Some participants question the equations that could be applied and the nature of the vertical velocity at maximum height.

Discussion Status

The discussion is ongoing, with participants exploring various equations related to vertical motion and questioning the initial vertical velocity. There is no explicit consensus yet, but guidance is being offered regarding the vertical component of velocity.

Contextual Notes

Participants are considering the implications of the projectile's initial angle and the effects of gravity on vertical motion. There is uncertainty regarding the correct application of equations and the signs associated with velocity components.

texmex
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A projectile is to be fired so that it just clears an obstacle 80m high at its maximum height.
http://img167.imageshack.us/img167/5729/physicszh7.jpg
a) by considering the vertical motion only, calculate the vertical speedand the time taken to reach its maximum height
b) if the distance between A to B is 100m, calculate the horizontal speed with which the ball was thrown.
c) Hence find v and Θ.


totally stuck at this, any help much appricated.
 
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Have you tried anything? What equations might be used? What can you say about the vertical component of the velocity at maximum height?
 
the farthest i got, was putting in the right angle, and as for equations that could be used, i think it may have something to do with - Vvertical= vsinΘ. not entirely sure though.
 
That would be the initial vertical velocity (is that a negative sign?). What is the vertical velocity at the instant of maximum height?
 

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