# As physics

posted by cake

Use the equations below:
P=mv
Ek=1/2mv^2
3) A railway carriage of 5.00 x 10^4 moves along a track at 2.50ms-1. It collides with a second, stationary, carriage with a mass of 4.00 X 10^4 kg and the carriages join together.

A) Calculate the initial velocity of the coupled carriages after the impact.
B) Calculate the change in kinetic energy during the collision and hence determine if the collision is elastic or inelastic and why.

10 marks
Use the equations above only do not use any other symbols write in ful lwords

1. bobpursley

a. Conservation of momentum applies.
5E4*2.50=(5E4+4E4)V solve for V
b. change in KE= initial KE-final KE
= 1/2 *5E4*(2.5)^2 -(1/2)(5E4+4E4)V^2
so if you get any number, there was a change in KE, and it is inelastic.
<<Use the equations above only do not use any other symbols write in ful lwords>>
Are you trying to hand in my work as yours? Sorry, I didn't just fall off of a turnip truck as a teacher. I teach, I dont symbols for you to turn in for credit as your thinking.

2. cake

Sorry, I just dont understand the symbols and thats why I say that in my class we use different things adnd every stage of lif u use different symbols which is why i say that as all tutors use the high most symbols learnt in uni probably

3. cake

like what is e by itself

4. cake

Also, when you write in words it helps me learn more but in symbols its like your assuming i know them but im not as clever as you i dont use uni symbols only as

5. cake

So i got 156,250-45000xv^2
then i found v which was 333.54
so that is what the velocity equALS(IDUNNO WHEN)
what do i do next and that doesnt show me the ke change to determine whether inelastic

6. cake

I UNDERSTAND IT NOW after going through it and thinking of what the symbols meant so thanks for making it clear

7. Henry

See your previous post: Thu, 11-30-17, 7:02AM.

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