Kicked a soccer ball at angle of 23 degree, at what angle can he kick the ball to get the same range or distance

A. they hold atoms  together with a molecule.its a force that exist between molecules. hope this .

Answer(b) both involve the use of levers;

Planck decided to assume that atoms could only vibrate at certain frequencies that were whole numbers eg 2f, 3f and so on. others used to think that atoms vibrate continuously