How can I calculate velocity and time in a physics lab on energy?

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Homework Help Overview

The discussion revolves around calculating velocity and time in a physics lab context, specifically related to energy, potential energy, and kinetic energy in a projectile motion scenario. Participants are attempting to understand the relationships between height, energy, and motion.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss using potential energy and kinetic energy to find velocity, with some questioning the necessity of mass in their calculations. There are attempts to derive equations related to motion and energy, and questions about the direction of velocity and acceleration.

Discussion Status

The discussion is active, with participants exploring different interpretations of the problem and offering insights into the relationships between energy and motion. Some guidance has been provided regarding the use of energy equations, but there is no explicit consensus on the approach to take.

Contextual Notes

Participants note the absence of mass in their calculations and express uncertainty about its role, suggesting that it may cancel out in the equations. There is also a mention of needing to consider both x and y components of motion.

astru025
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Physics lab on energy need help!

Homework Statement



Need to find velocity and time when I know all lengths/heights. Need to look at picture to fully understand my problem.

Homework Equations



Projectile motion equations... And velocity equations..

The Attempt at a Solution


On picture
 

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Since you know the height of the ramp, you know the potential energy which all gets converted into kinetic energy coming off the ramp. Since you know the kinetic energy, you know the velocity... since you know the velocity, and the height of the table, you know how far it will go before it hits the ground.
 
Ok so my kinetic energy would be mass x 9.8 x .05 (height of ramp). Is this right? I don't know the mass though.
 
astru025 said:
I don't know the mass though.

Maybe you'll get lucky and it will cancel or drop out of your solution. :wink:
 
Okay so I came up with v^2= 2gh. 2 x 9.8 x .05 = .98 and the square root of .98 is .99. This is my velocity. Then to find my time do I divide my velocity by .75?
 
no, the velocity is is in the x direction right? How fast will it accelerate towards the ground in the y direction?
 

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