Suppose Sand Is Leaking from an Unpowered but Moving Railroad

Multiple Choice

Suppose sand is leaking from an unpowered but moving railroad car. Since the sand is moving forward along with the car as it leaks out, it carries kinetic energy out of the car. This mass transfer will

A) Cause the car's speed to increase.
B) Cause the car's speed to decrease.
C) Have no effect on the car's speed.