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21.
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A
boy is sitting at the back seat of a car. When the driver suddenly starts
moving the car (in forward direction), the boy experiences a backward force?
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A.
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Always
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B.
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Never
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C.
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Often
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D.
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Sometimes
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Answer: Option A
Explanation:
When a car suddenly starts the lower part of
the boy's body will be in the motion while his upper will be at rest.
Hence he will always experience backward
force:
