A car of mass 120kg moving at a velocity 200km/h collide with car B of mass 100kg moving at a velocity of 220kg/h with both cars on a friction less surface. After collision, both car joined together and move at a common velocity, V. (i)calculate the total momentum of the two cars before collision
(ii)calculate the velocity of the joint cars cars after impact

There is no graph to look at on here, but i shall explain them to you. a line graph is just in its title it’s a graph with a line running through the dots to show an increase or decrease. a bar graph is used to show how much or how little something is so a comparison. a scatter plot is used to graph points to tell the data. and i don’t know what a histogram is.

That depends on what kind of environ meant it is in  in space it has the same force that was applied when the velocity was gained