You throw a ball straight up with an initial velocity of 15.0 m/s. it passes a tree branch on the way up at a height of 7.00 m. how much additional time will pass before the ball passes the tree branch on the way back down?

Astone is dropped with no initial velocity from the top of a cliff and hits the ground a time of 3.9 s later. what is the height of the cliff, in units of meters? you may assume that air resistance is negligible. give the answer as a positive number question 15 a figure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 200 o 20.9 12000 o 3.33

What are atoms of the same element with varying number of neutrons

Most short-period comets do not have randomly oriented orbits because