Pls help i need this to finish my assignment Why did the toy car stop? where did the energy go?

For some context im doing this experiment for my science class and i had to roll a toy car across a room.

Ithink your answer is d

A. to determine if humans can explore mars safely

Honestly "global warming" may be a slight possiblity, however they called it "climate change" because its not real, in fact we had one of our coldest days here not too long ago, and the "issues" with this subject is a blindfold for actual problems.

Molybdeum(mo)orruthenium (ru)actually, elements with similar chemical properties as technetium would bemn, re, and bh. this is because elements in the same group/family (column) have similar chemical properties. elements in the same period (row) have the same number of energy levels (or shells).