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A ball is dropped from rest from a height of $1 \: m$ in a frictionless tube as shown in the figure. If the tube profile is approximated by two straight lines (ignoring the curved portion), the total distance travelled (in $m$) by the ball is _____ (correct to two decimal places)

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Answer: Infinite or wrong question as NAT( Numerical answer type)

Reason: because it is asked to find the distance travelled while all the contact surfaces are assumed frictionless.

In the solution, the distance of ball is calculated only till the ball first goes down in the vertical tube then goes up in the inclined tube.

Will the ball not come down?
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sir revise answer key in gate overflow as this question is provided marks to all.
Answer:

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