Fernanda rolls a ball off of a desk with an initial horizontal velocity of 0.98m/s. The desk is 0.87 meters high. Find the time it takes for the ball to hit the ground. Find the horizontal distance it travels.

Will you chech and finish these for me, because i am stumped with them.

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.

Which statements did both aristotle and ptolemy assume? check all that apply.