Consider the track in $($Figure $1).$ Neglect the size of the car.

Part A

Determine the required height $h$ of the roller coaster so that when it is essentially at rest at the crest of the hill $A$ it will reach a speed of $88k\frac{m}{h}$ when it comes to the bottom $B.$

Express your answer to three significant figures and include the appropriate units.

$h=$

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Part B

Also, what should be the minimum radius of curvature $$ for the track at $B$ so that the passengers do not experience a normal force greater than $4mg=(39\mathrm{.}24m)N?$

Express your answer to three significant figures and include the appropriate units.

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