A block of mass $$m$$ is kept in an elevation which starts moving downward with an acceleration $$a$$ as shown in figure.

The block is observed by two observers $$A$$ and $$B$$ for $$a$$ time interval $$t_{0}$$.

According to the observer $$A$$

the work done by normal reaction is zero

the work done by pseudo-force is zero

all of the above

the work done by gravity is zero

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Solution

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Correct option is D. all of the above

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A block of mass $$m$$ is kept in an elevation which starts moving downward with an acceleration $$a$$ as shown in figure. The block is observed by two observers $$A$$ and $$B$$ for $$a$$ time interval $$t_{0}$$.According to the observer $$A$$

Correct option is D. all of the above

A block of mass $$m$$ is kept in an elevation which starts moving downward with an acceleration $$a$$ as shown in figure.

The block is observed by two observers $$A$$ and $$B$$ for $$a$$ time interval $$t_{0}$$.

According to the observer $$A$$