A stone is thrown upward with a velocity 72km/hr. If air resistance is neglected, find the maximum height travelled by it and the time taken fpr it to return to the intial position.

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?

I’ve been stuck on this for a while

An astronaut on the moon throws a baseball upward. the astronaut is 6 ft, 6 in. tall, and the initial velocity of the ball is 3030 ft per sec. the height s of the ball in feet is given by the equation s equals negative 2.7 t squared plus 30 t plus 6.5s=−2.7t2+30t+6.5, where t is the number of seconds after the ball was thrown. complete parts a and b.