(PLEASE HELP ASAP) a teacher drops a book to wake up his class, and the book hits the ground after 0.5 seconds. How high was the book?

Abaseball is thrown a distance of 20 meters. what is its speed if it takes 0.5 seconds to cover the distance

Which describes an image that can be produced by a concave lens? the image is real and smaller than the object. the image is virtual and larger than the object. the image is virtual and smaller than the object. the image is real and larger than the object.

What is meant by the statement" the melting poin of glycerine is 13 degree celsius