Question

two balls are thrown from the top of a building. one is thrown up and the other is thrown down, both with the same initial speed. ignoring air resistance, what are their speeds when they hit the street? multiple choice they are traveling at the same speed. it depends on the height of the building. the one thrown up is traveling faster. the one thrown down is traveling faster.

Explanation:

Using conservation of mechanical energy (kinetic + potential), both balls start with same initial speed (same KE) and same height (same PE). When hitting the street, they have same PE change (since same height difference), so same KE and thus same speed. Air resistance is ignored, so energy is conserved.

Answer:

A. They are traveling at the same speed.