A toy boat moves horizontally in a pond. The horizontal position of the boat in meters over time is shown below.
Position
(meters)
15+
12+
9+
6+
3+
Time
(seconds)
↑
4
8
12
16 20 24
-3+
-6+
-9
-12+
-15-
What is the displacement of the boat between 0s and 16 s?

The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656(red) and 486 (blue). light from a hydrogen lamp illuminates a diffraction grating with 500 lines per mm, and the light is observed on a screen 1.50 behind the grating. what is the distance between the first-order red and blue fringes?