A Vehicle That Weighs 4000 N on the Surface of the Earth

Multiple Choice

A vehicle that weighs 4000 N on the surface of the Earth is travelling in outer space at a speed of 200 m/s. The smallest constant force that must be applied to stop it in 20 seconds is

A) 4000 N.
B) 40 N.
C) 400 N.
D) 20 N.
E) more than 4000 N.