Looking at a modified atwood machine, when the cart is released, the force senso

Question

Looking at a modified atwood machine, when the cart is released, the force sensor measures the force exerted on the cart (the tension in the string pulling it), and the computer creates a graph of force (on the y-axis> vs. time (on the x-axis). Ideally: as the mass accelerates, what should this graph look like after the cart is released and before it hits the barrier?

a) start as a straight line increasing in magnitude, and then level off to a flat line
b) a straight line parallel to the x-axis
c) a straight line starting from the origin and decreasing in magnitude
d) a parabola starting from the origin and increasing in magnitude
e) a parabola starting from the origin and decreasing in magnitude
f) a straight line starting from the origin and increasing in magnitude

Explanation / Answer

a straight line parallel to the x-axis

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