A student applied a force of 200 N to push a box 15 m down the sidewalk. Given the formula, W=F×d, how much work has been done?

Since the pully is a simple machine so the mechanical advantage is a 1

The geological theory that states that pieces of earth's lithosphere are in constant slow motion is the theory of plate tectonics.

I'm having some difficulty seeing the diagram clearly.but the question says there's a net inward force on the object.so we know right away,  from newton's 2nd law of motion, thatthat baby is accelerating.  it doesn't even matter which way thenet force is pointing.  if there's any net force, then either theobject's speed or else its direction must be changing.

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