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Vector Addition

Which of the ...

Question

Which of the following is(are) example(s), which shows that a negative acceleration can be associated with a speeding up object?

A

An object in simple harmonic motion.

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B

water in a U-tube which is slightly disturbed

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C

A body on a rough horizontal plane

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D

None of the above

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Solution

The correct options are
A An object in simple harmonic motion.
B water in a U-tube which is slightly disturbed
(A)In case of S.H.M, restoring forces act on a particle and it is the direction of mean position which is in opposite direction of motion, so in this case acceleration directed negative direction.
(B)Water is slightly disturbed in 'u' tube also performed S.H.M.. Hence it also has negative acceleration.

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