In reality the skateboarder isn't a simple particle: assume that his mass in a deep crouch is concentrated 0.75 m from the half-pipe. if he remains in that position all the way up, what initial speed does he need to reach the upper edge?

co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms

the assestment will probley apele with cause and effect

i really dont know but i will try okay.

so i think u would just add all them up and get your answer..