I have the following question: Two cushions of a snooker table W1 and W2 meet at right angles. A snooker ball travels across the table and collides with W1 and then W2. The cushions are modelled as smooth. Just befor3 the first impact the ball is moving with speed u ms-1 at an angl3 of 20⁰ to W1. The coefficients of restitution between the ball and the cushions W1 and W2 are 1/2 and 2/5 respectively. Find the p3rcebtage if the balls original kinetic energy that is lost in the collisions.

The model answer uses a weird method I don't understand. But i used me own method to find w, however I end up with 0.485u and they get 0.413. Does anyone know where I went wrong or is able to explain a better method?

The model answer uses a weird method I don't understand. But i used me own method to find w, however I end up with 0.485u and they get 0.413. Does anyone know where I went wrong or is able to explain a better method?

Original post by Amy.fallowfield

I have the following question: Two cushions of a snooker table W1 and W2 meet at right angles. A snooker ball travels across the table and collides with W1 and then W2. The cushions are modelled as smooth. Just befor3 the first impact the ball is moving with speed u ms-1 at an angl3 of 20⁰ to W1. The coefficients of restitution between the ball and the cushions W1 and W2 are 1/2 and 2/5 respectively. Find the p3rcebtage if the balls original kinetic energy that is lost in the collisions.

The model answer uses a weird method I don't understand. But i used me own method to find w, however I end up with 0.485u and they get 0.413. Does anyone know where I went wrong or is able to explain a better method?

The model answer uses a weird method I don't understand. But i used me own method to find w, however I end up with 0.485u and they get 0.413. Does anyone know where I went wrong or is able to explain a better method?

w = 0.413u

Is it a typo at the end?

Original post by mqb2766

Original post by Amy.fallowfield

I have the following question: Two cushions of a snooker table W1 and W2 meet at right angles. A snooker ball travels across the table and collides with W1 and then W2. The cushions are modelled as smooth. Just befor3 the first impact the ball is moving with speed u ms-1 at an angl3 of 20⁰ to W1. The coefficients of restitution between the ball and the cushions W1 and W2 are 1/2 and 2/5 respectively. Find the p3rcebtage if the balls original kinetic energy that is lost in the collisions.

The model answer uses a weird method I don't understand. But i used me own method to find w, however I end up with 0.485u and they get 0.413. Does anyone know where I went wrong or is able to explain a better method?

The model answer uses a weird method I don't understand. But i used me own method to find w, however I end up with 0.485u and they get 0.413. Does anyone know where I went wrong or is able to explain a better method?

w = 0.413u

Is it a typo at the end?

Sorry. Yes they got 0.413u and I got 0.485u

Original post by Amy.fallowfield

You calculate

w = 0.413u

Is it a typo at the end?

w = 0.413u

Is it a typo at the end?

Sorry. Yes they got 0.413u and I got 0.485uNo. You get 0.413 as well

https://www.wolframalpha.com/input?i=sqrt%28%28sin%2820+degrees%29%2F2%29%5E2+%2B+%282cos%2820+degrees%29%2F5%29%5E2%29

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