If you drop a rock on Mars from a height of 1.20 m, at what speed does it hit the ground? MMars=6.42×1023kg, RMars = 3390 km.

Ithink it is letter b, i may be wrong but i think that is the answer

The fuzzy edges of shadows are a result of  diffraction 

When calculating percentage we need two numbers. one number represents total amount of certain thing and another number represents partial number of that thing. then we divide those two numbers.in this problem total amount represents total number of weeds growing on some surface. partial number represents chicory.percentage = partial / total * 100%percentage = 29 / 98 * 100%percentage = 29.6%our calculation is closest to answer b) so this is our correct answer.

The answer would be true, hope this ! : )