According to the momentum principle, the change in momentum of an object equals the impulse, which depends on

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Can you give more detail  

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.

g gravitational constantm mass of asteroids 1 and 2r distance between the asteroidsf force of gravity