What is the increasing order of the wavelengths of the following colours?
1. Orange
2. Indigo
3. Yellow
4. Violet
1, 2, 3 and 4
3, 1, 4 and 2
1, 3, 2 and 4
4, 2, 3 and 1
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A ball is dropped from the top of a high building with a constant acceleration of 9.8 m/s2. What will be its velocity after 2 seconds?