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 30.0ยบ 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
