A50.0-kg block is being pulled up a 15.0° slope by a force of 250 n which is parallel to the slope. the coefficient of kinetic friction between the block and the slope is 0.200. what is the magnitude of the acceleration of the block?

it has to be b, about 97 percent.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.

3. dark matter

empty space could also be a simple vacuum