# Centripetal acceleration/ motion question

#### chudzoik

I am trying to calculate the speed of an object at the point that it flys off the half circle ramp, and I was wondering if it would be correct to use the formula v2=v20+2aΔx to calculate the final velocity of the object as it exits the half circle thing.

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#### tiny-tim

Science Advisor
Homework Helper
welcome to pf!

hi chudzoi! welcome to pf! (what does centripetal acceleration have to do with this? )
… I was wondering if it would be correct to use the formula v2=v20+2aΔx to calculate the final velocity of the object as it exits the half circle thing.
that's a linear acceleration formula, isnt it?

hint: always check first whether you can use a conservation equation #### chudzoik

I honestly have no idea what your hint means :tongue:
Can you explain further about what formula I'm supposed to use?

#### tiny-tim

Science Advisor
Homework Helper
do you know any equations called "conservation of (something)"? (i may have gone to bed by the time you answer :zzz:)

#### chudzoik

Well I know conservation of momentum, but I don't know how it would apply to my question.

#### tiny-tim

Science Advisor
Homework Helper
aha!

you'll need to look up conservation of energy #### chudzoik

Is that the formula with 1/2 mv2 and mgh in it? I looked it up and it came up with stuff like Δ(U+K) = 0 and U + K = E which don't look familiar to me at all. I'm in Grade 12 right now, so should I have learned it?

#### SHISHKABOB

yeah that's what you'll be wanting to use for this problem, it's the same idea as conservation of momentum: initial = final

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