A roller coaster car starts from the top of a hill (a), 16 m high. The car then gradually coasts along the path (b) to the bottom (c) and up to the top of the adjacent hill (d), 9 m high. Ignoring friction and other resistive forces, how fast is the car going at point (d)

 

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XXXX (a) (b) (c) (d) XXXX (a) (b) (c) (d)