Acceleration of the object is expressed as:

$\overline{){\mathbf{a}}{\mathbf{=}}\frac{\mathbf{\u2206}{\mathbf{v}}_{\mathbf{x}}}{\mathbf{\u2206}\mathbf{t}}}$

Newton's second law:

$\overline{){\mathbf{\Sigma}}{\mathbf{F}}{\mathbf{=}}{\mathbf{m}}{\mathbf{a}}}$, where F is the net force, m is the mass, and a is the acceleration of the object.

The figure(Figure 1) shows the velocity graph of a 2.7kg object as it moves along the x-axis.

What is the net force acting on this object

A. At t= 1 s?

B) At 4 s?

C) At 7 s?

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