What are two problems associated with the use of solar energy?

Actually, there are a lot of problems associated with the use of solar energy but would like to highlight at least two. The first one that hampers the use of it is its cost. The second one is land use and habitat loss, water use, and the use of hazardous materials in manufacturing.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.