The energy stored in a spring of stiffness constant k = 2000 Nm-1 when extended by 4 cm is

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

When using the scientist method, which step comes last?