John pushes his brother danny on a skateboard. john applies a force of 150 n and danny's acceleration is 1.2 m/s^2. what is the combined mass of danny and his skateboard

The slope of a velocity time graph over any interval of time gives the during that interval

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.

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