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M1 a challenging pulley question help !

1464958682290434130295.jpg hi for part b of this question, it asks for v when a hits pulley. However, the distance from a to pulley is 0.7m though. Why is the distance 0.3m in the mark scheme. And also for part c surely if the the length of the string would have been 1.1m for b after a hit the pulley. Can anyone explain the distance bit thanks.
Reply 1
Avatar for studk99
studk99
length of the string is 0.7m. to get a distance of 0.3m you subtract the length from b to the pulley, 0.4m, from 0.7m
Reply 2
Avatar for coconut64
coconut64
OP
16
Original post by studk99
length of the string is 0.7m. to get a distance of 0.3m you subtract the length from b to the pulley, 0.4m, from 0.7m


So the string connecting a to pulley isn't 0.7m but instead the total length is 0.7m? Thanks.
Reply 3
Avatar for Zacken
Zacken
22
Original post by coconut64
So the string connecting a to pulley isn't 0.7m but instead the total length is 0.7m? Thanks.


Yes.

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