In deep space, an object is traveling at constant speed in a straight line. Then it is observed to change its direction of travel. What can the observer conclude?
A.
The forces acting on the object must have changed.
B.
The object's mass must have changed.
C.
The object's speed must have changed.
D.
Enough time had elapsed to slow the object down.
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The observer can conclude that the forces acting on the object must have changed. (Option A)
• According to the Newton's first law of motion,an object with some amount of velocity will always travel in a straight line until any external force acts upon that object.
• Which means,to change the direction of the motion of an object even in the deep space,we have to apply some amount of external force upon that object.
• That's why the observer can conclude that the acting force upon that object must have changed.
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