What are the animal life like in the tundra

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below. your friend goes first, and you follow after he has dropped a distance of 2.0m. when your friend hits the water, is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?