I think the answer is B. <span>Engineers apply math and science to solve problems. This answer is the most correct and precise among the four answers</span>
You could probably expect normal plant growth, as a white light is similar to the sun in the respect that it contains all colors of the spectrum.
The work done is
Work Done = Change in Kinetic Energy (ΔKE)
<u>Explanation</u>
In first 1 hour it travels 72 km
So, Velocity =
or, Initial Velocity (u) = 20 m/s
Similarly for the next hour it covers 90 km
So, Velocity =
or, Final Velocity (v) = 20 m/s
Work done = Change in Kinetic Energy (ΔKE)
Work done = ΔKE =
ΔKE =
= = 281250 joule
=