Why don't skateboarders keep flying through the air when they launch off a ramp? * 3 points a. the force of gravity works against the skateboarders' inertia. b. skateboard wheels don't spin fast enough to keep them moving very far. c. the skateboarders have no inertia when they launch off a ramp. d. skateboards do not use newtons to move around the ramps.

A.

Explanation:

Gravity pulls all objects toward the ground. With no way to combat this while in the air (lift), they will always hit the ground at some point

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

with the invention of the automobile, the woman of the house could drive to the store and get groceries. women were also free to socialize more. during world war ii women were allowed to work in factories to the war effort and could drive to work or ride mass transit buses to their jobs.