Discover new knowledge and insights with IDNLearn.com's extensive Q&A database. Get accurate and comprehensive answers from our network of experienced professionals.

A ball is thrown upward at a velocity of 15 meters per second from a height that is 20 meters above the ground. The height h (in meters) of the ball at time ( (in seconds) after it is thrown can be found by the formula below

h − − 5t² + 15t +- 20

Find the time when the ball is again 20 meters above the ground​