If you push five times as hard against a non-moving wall, the amount of work you do A) remains constant but non-zero.
B) doubles.
C) quadruples.
D) is cut in half.
E) zero.

remains constant but non-zero

Explanation:

the force you apply will increase but in the question it stated a non-moving wall hence making it non- zero .

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

increase masses, decrease separation