An object moving forward at 10 m/s suddenly begins moving backward at 5 m/s. What is the most accurate explanation for this change?
a. The forces pushing the object forward became greater than the ones pushing the object back causing it to change direction.
b. The force pushing back on the object became greater than the force pushing the object forward.
c. The object was traveling in a straight line until it hit a brick wall and bounced backward.
d. The forces were ubalanced in the forward direction. Then they became balanced in the backward direction.
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