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A : In the presence of air resistance, i...

A : In the presence of air resistance, if the ball is thrown vertically upwards then time of ascent is less than the time of descent.
R : Force due to air friction always acts opposite to the motion of the body.

A

If both assertion and reason are correct and reason is a correct explanation of the assertion.

B

If both assertion and reason are correct but reason is not the correct explanation of assertion.

C

If assertion is correct but reason is incorrect

D

If assertion is incorrect but reason is correct.

Text Solution

Verified by Experts

The correct Answer is:
a
While ascending or descendig , particle covers the same distance . Acceleration during the downwards motion `(g -F//m)` is less than retardation during upwards motion (g+f/m). Hence using `h = (1)/(2)gt^(2)` we can understant that time of ascent is less than the time of decent .
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