In a circus act, a 20-kg dog is trained to jump onto a 20.0-kg skateboard moving with a velocity of 0.20 m/s. at what velocity does the dog jump into the skateboard if afterward the velocity of the dog and skateboard is -0.20 m/s?

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.

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

In a good thermo flask the main cause of heat loss is