In which of the following events, does NOT involve a resultant force?
A
Throwing a ball
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B
Space ship moving at a constant velocity
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C
Pressing a moving block to stop it
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D
Twisting a rod
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Solution
The correct option is B Space ship moving at a constant velocity All the events discussed here involve action of a force. A force is required to change the state of rest or that of motion, or change the shape\size of the object. Heating of a ball does not involve a force in this case, since it does not change the state of motion of the object.