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.