29.A girl wants to slide down a 'frictionless' playground slide. If she starts at rest from 'X' and slides down to 'Y', which of the following slide shapes will give the girl the greatest possible speed upon reaching 'Y'? All the slides have the same vertical . X A X B x C x D height. a. b. C- Y Y Y d. e. She gets to the bottom of all the slides with the same speed. COED}