What is the average acceleration of the particle between 0 seconds and 4 seconds?

How do you tell if someone actually cares about you? and just say they do?

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?

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?