Assuming no other forces are acting on the wheelbarrow, it must be stationary.

When an opaque obstacle is placed between a source of light and a screen, a shadow of the obstacle is formed on the screen. The kind of shadow depends on the size of the source of light. In other words, the earth casts its shadow on the moon. The solar eclipse occurs when the moon comes between the sun and the earth.
Answer:
X: Always attractive
Y: Infinite range
Z: Attractive or repulsive
ANSWER IS C
Answer:The place to go for the answer to such an easy question is the SI Brochure, the document which defines the SI and all its units.