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# impulse, momentum and coefficient of restitution further maths question help watch

1. I need help with this question i only need part (ii) but i attached part (i) as well.
https://imgur.com/a/JPPx0.

this is my working out for it which gives the wrong answer ive attached my working for part (i) also.
https://imgur.com/95z2STk

i dont know what to do, i feel like ive made a silly mistake somewhere but i just dont know where ive gone wrong.

if you could help me out that would be wonderful.

thank you
2. (Original post by amin11234)
I need help with this question i only need part (ii) but i attached part (i) as well.
https://imgur.com/a/JPPx0.

this is my working out for it which gives the wrong answer ive attached my working for part (i) also.
https://imgur.com/95z2STk

i dont know what to do, i feel like ive made a silly mistake somewhere but i just dont know where ive gone wrong.

if you could help me out that would be wonderful.

thank you
You've worked out the velocity of B following the 1100 Ns impulse, incorrectly.

The initial velocity of B was 20 m/s, and it suffers a retarding impulse due to the string, so how can it now be 25.5 m/s ?

Have another think/go.

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