Kinetic Energy Calculations. Easy to Super hard. Ek=1/2mv^2

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PhET Interactive Simulations
University of Colorado Boulder

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[alexalemayehu]

The super hard question, you should not convert Joules to KJ

[thomashagey]

Prim, proper, compelling and quite brilliant… you've made my day… Kudos for Primrose the Kitten. But I have a question ( ? )

[simiatwal]

For the super hard question, why did we need to turn the 29J into kJ?

[LuciusHill]

the super hard should be 1.85m/s (2sf)

[oamiji]

For the hard question why the hell have you left out the mass if ur trying to find it out? It just doesn’t make sense if it’s 250g just divide it by 1000 to get 0.25 I don’t see why you are squaring 5.8 and then doing the equation

[acen]

Why did you convert the J to kJ before substituting it into Ek-1/2mv^2? I though that the unit for energy in the energy equations was always just Joules on its own.

[raeturner]

How come everyones equations are differ from others? This is whats difficult is everyone else doing it different from others. Woo

[oamiji]

The super hard question doesn’t make sense you did it wrong

[wyskun]

I have a very important question for me:)
In space, there is a space shuttle that does't move.
Suppose that its mass is always constant.
This space shuttle has a rocket engine with a constant force of 100N.
When the engine is started and the ship has a constant thrust of 100N, when the ship starts to accelerate, will the acceleration be constant and remain constant (let's assume 10m / s), or maybe the acceleration will start to decrease as the speed increases? It is related to the rule Ek = 1 / 2mv ^ 2 ??

[Bros]

Does gravity not have a value of 9.81?

[nadinejabarine]

if you don't understand why you are doing stuff in physics and you just follow the formulas of physics blindly ! don't download videos and try to teach the same wrong perspectives to young people trying to grasp a different perspective, people watching this are a young generation running away from this way of teaching . people like you who just got high grades and became teachers with out understanding it whole are just creating generations where we follow a formulas blindly to get an A instead of understanding it, where it came from and why is it here ! stop setting our awareness back !!!

[cocomckoy]

for the super hard question that answer is very

[cemaltan]

right of the bed thats the cutest accent ive ever heard