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

AI Thread Summary
To calculate velocity and time in a physics lab on energy, one can use the principles of energy conservation, where potential energy at the height of the ramp converts to kinetic energy. The kinetic energy can be expressed as mass times gravitational acceleration times height. The derived velocity from the height of the ramp is found using the equation v^2 = 2gh, resulting in a velocity of approximately 0.99 m/s. For time calculations, the discussion highlights the need to consider vertical acceleration due to gravity, rather than dividing velocity by horizontal distance. Understanding these relationships is crucial for accurately determining motion parameters in projectile motion scenarios.
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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