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- Homework Statement
- A cart is constrained to move along a straight line. A

varying net force along the direction of motion is exerted on

the cart. The cart’s velocity v as a function of time tis

shown in the graph above. The five labeled points divide

the graph into four sections.

During some part of the motion, the work done on the cart

is negative. What feature of the motion indicates this?

A. Speed is increasing

B. Speed is decreasing

C. Acceleration is increasing

D. Acceleration is decreasing (INCCORECT)

- Relevant Equations
- W = (f)(d)(cos(theta))

Knowing that negative work occurs when the force applied to an object opposes the direction of displacement, and that the direction of acceleration vector should align with the force vector, I assumed the correct answer was that the indication of negative work comes from negative acceleration, however this is incorrect, does anyone know why this logic is faulty/doesn't work?

This is the graph btw:

This is the graph btw: