If 2 balls had the same volume but ball a has twice as much mass as babil which one will have the greater density

Player kicks a soccer ball from ground level and sends it flying at an angle of 30 degrees at a speed of 26 m/s. what is the horizontal velocity component of the ball to the nearest tenth of a m/s?

What is the measurement of how fast an object moves relative to a reference point?

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?