A roller coaster starting from rest descends 35 meters in its ...

[mpobi80]

A roller coaster starting from rest descends 35 meters in its initial drop and then rises 23 meters when it goes over the first hill, which has a circular shape over the top.
 
  If a passenger at the top of the hill feels an apparent weight equal to one-half of her normal weight, what is the radius of curvature of the first hill? Neglect any frictional losses.

Question 2

From the Earth, the Earthlings see the Enterprise approaching from the west at 0.800c and the Klingons approaching from the east at 0.900c. What speed, in terms of the speed of light, does the crew of the Enterprise measure for the Klingon ship?
 
  What will be an ideal response?

[snackralk]

Answer to Question 1

48 m

Answer to Question 2

0.988c

[mpobi80]

Thanks

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