Is this a mistake in the M1 textbook?

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Goldenknight
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Question 1 part c

Answer sheet says

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I got 0.28m as an answer from the initial position. I have no idea why there is a 2 2/7m written there. Its confusing me so I need a confirmation if my guess is right or not
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gdunne42
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(Original post by Goldenknight)
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Question 1 part c

Answer sheet says

Name:  2.PNG
Views: 8
Size:  66.5 KB

I got 0.28m as an answer from the initial position. I have no idea why there is a 2 2/7m written there. Its confusing me so I need a confirmation if my guess is right or not
From it's initial position, B has already travelled 2m from it's initial position when A hits the ground and travels a further 2/7 m before it stops. 2 + 2/7 = 16/7 By keeping the working in exact fractions and in multiples of g rather than rounded decimal approximations you reach the answer 2/7 for additional travel rather than your 0.28
Last edited by gdunne42; 1 month ago
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Goldenknight
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(Original post by gdunne42)
From it's initial position, B has already travelled 2m from it's initial position when A hits the ground and travels a further 2/7 m before it stops. 2 + 2/7 = 16/7 By keeping the working in exact fractions and in multiples of g rather than rounded decimal approximations you reach the answer 2/7 for additional travel rather than your 0.28
Aah I I got it now thanks. Its kind of like B will dangle up when A hits the ground right?

I should have thought. There are some mistakes in the book that is why so thought it could be a mistake too
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gdunne42
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(Original post by Goldenknight)
Aah I I got it now thanks. Its kind of like B will dangle up when A hits the ground right?

I should have thought. There are some mistakes in the book that is why so thought it could be a mistake too
Yep B is connected to A so moves up as much as A falls and then will continue to move upwards for a bit after A hits the ground until gravity brings it to a halt.
As you say there are lots of errors in text books so always worth a check.
Last edited by gdunne42; 1 month ago
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