The distance-time graph below represents the position of an object moving in a straight line. wha is the speed of the object during the time interval t=2.0 seconds to t=4.0 seconds?

You can watch static electricity in action by rubbing an inflated balloon against your hair. your hair will actually stand on its end! it does this because each hair becomes charged, and they all repel one another.

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?

Is the vertical component of velocity ever zero?