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Instantaneous velocity of a object in projectile motion 
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#1
Nov1310, 08:08 PM

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1. The problem statement, all variables and given/known data
stone is thrown horizontally with a initial speed of 8.0 m/s (Vxi) Air resistance is negligible. average acceleration due to gravity = 9.8 N/Kg (down) [ay] 2. Relevant equations dx= Vxi/ time Vfy= vyi + ay x time Instantaneou velocity equation? :S 3. The attempt at a solution okay so it tells me to find horizontal and vertical components of displacement and instantaneous velocity at time=0.0s/1.0s/2.0s and 3.0s isn't Vyi given (initial y velocity SINCE it's 0?) and (vxi is also give  8.0 m/s) BUt how do i find INSTANTANEOUS velocity? 1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution 


#2
Nov1410, 06:37 AM

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Hi NightRunnerz! Welcome to PF!
(and if you need the speed, use Pythagoras! ) 


#3
Nov1410, 09:56 PM

P: 2

OKAY so by velocity you mean V as in speed right?
dotdotdot m/s2? .....m/s2? 


#4
Nov1510, 02:24 AM

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Instantaneous velocity of a object in projectile motion
Hi NightRunnerz!
(just got up …) Speed is the magnitude of velocity. Velocity has components, speed doesn't. The question tells you to find the horizontal and vertical components of instantaneous velocity … that's v_{x} and v_{y}. 


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