The force Fx= 1.20x2 - 3.00x - 2.50, where Fx is in Newtons and x is in meters. How much work is done by the force Fx in displacing an object from x = 2.00m to x = 5.00m?

think about the oscillation of the toy shown in the video. when the toy is at the highest point of its motion, its velocity is zero and its acceleration is negative.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

b. a lightning bug, plug of grass, and a worm

3. dark matter

empty space could also be a simple vacuum