Change in color
Change in color is a physical reaction
B. Both of these types of lenses have the ability to produce real images.
As per the question, the distance travelled by bobsled [s] = 100 m
The time taken by the bobsled to travel that distance [t] = 25 s
We are asked to calculate the speed of the bobsled.
The speed of the bobsled is calculated as -




Hence, the correct answer to the question is A. 4 m/s.
A complete cycle of phases is 29.531 days.
From full-moon to new-moon is half of that.