If the mass of the roller coaster cart is 20,000 kg and it is moving toward location X at a velocity of 10 m/s, what is its kinetic energy?

KE= 1000000 J

Explanation: The kinetic energy of the coaster can be calculated using the formula KE= 1/2 mv²

KE = 1/2 mv²

= 1/2 ( 20,000 kg) (10 m/s)²

= 1000000 J

first one is the correct answer

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.