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A 1300 kg roller coaster begins at a speed of 4.0 m/s and a height of 30 m above the ground. It rolls down the
A 1300 kg roller coaster begins at a speed of 4.0 m/s and a height of 30 m above the ground. It rolls down the track to ground level. When it is 20 m above the ground its speed is _____ m/s. When it reaches the ground, its speed is ____ m/s. Enter the four digits in order without spaces or characters between them.
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