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8 question please .I have attached the question.Please helpe solve it

8 question please .I have attached the question.Please helpe solve it

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Grade:11

1 Answers

Mahesh Koilada
22 Points
3 years ago
steps to answer:
1. speed at A is zero (assumption)
2. let the length of the straigth track is covered in t1 sec and curved track in t2 sec
3. time of travel is minimum when acceleration is maximum
4. so the acceleration is “a”
5. now write equation of linear motion for straight and curved portions separately
6. and solve for t1+t2
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(t1+t2)min=sqrt(2/a(l+pi*r))

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