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physics help

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IGSTUDENT:
needed help on following q's...

1. Calculate the final speed of a 1500 kg roller coaster if it has an initial speed of 16 m/s but reduces its elevation by 8.6 m by coasting down a frictionless incline.

2. A 0.50 kg cue ball makes a glancing blow to a stationary 0.50 kg billiard ball. After the collision the cue ball deflects with a speed of 1.2 m/s at an angle of 30.0º from its original path. Calculate the original speed of the cue ball if the billiard ball ends up travelling at 1.6 m/s.

thanks

Shoshou..Mony:
This is not the right child-board. It should be in Subject doubts. =]

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