A boy riding a skateboard have a combined mass of 50 kg. He is moving at 4 m/s and carrying a stone that weighs 10kg. How fast must the stone be thrown forward so that the skater comes to a stop

answer and explanation;

composition refers to both the types of minerals within a rock and the overall chemical makeup of the rock while texture refers to the size and arrangement of the minerals or grains that make up a rock. both composition and texture can be used to classify rocks, such as igneous rocks. texture describes how the rock became solid or crystallized from liquid, melted rock. composition of a rock describes the minerals that make up a particular rock.

Sorry i don’t know what to do

The big glowy thing is called the sun it is a star in our galaxy and is over 1 million degrees

Mass of bob (g)will be the answer