How much force does it take to accelerate a 20 kg scooter speed from 10 m/s to 20 m/s? a. 1000 j b. 3000 j c. 4000 j d. 100 j

That depends on how fast you want the speed to change from 10 m/s to 20 m/s.  This is just another way of saying "what you want the acceleration to be".

F = m A

Force = (mass) x (acceleration)

If you want the speed to change from 10 m/s to 20 m/s in 1 second, then

Force = (20 kg) x (10 m/s²) = 200 Newtons

If you can wait a whole day for the speed to change gradually, then

Force = (20 kg) x (10 m/s)/(86,400 sec) = 0.00231... Newton

-- 1000 Newtons will complete the change of speed in 0.2 second

-- 3000 Newtons will complete the change of speed in 0.067 second

-- 4000 Newtons will complete the change of speed in 0.05 second

-- 100 Newtons will complete the change of speed in 2 seconds

Even if you KNOW the required acceleration, none of the choices on the list can be the correct force, because ' j ' is not even a unit of force.

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods