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If the air resistance causes a vertical ...

If the air resistance causes a vertical retardation of 10% of value of acceleration due to gravity, then the time of flight of an oblique projectile will be decreased by nearly:

A

0.06

B

0.07

C

0.08

D

0.09

Text Solution

Verified by Experts

The correct Answer is:
D
Here `t=(2vsintheta)/g`
and `t.=(2vsintheta)/(g + (gxx10)/100)=(2vsintheta)/(11/10.g)`
or `t/(t.)=11/10`
Then %age increase =`(t-t.)/txx100`
`=(11-10)/11xx100approx9%`
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MODERN PUBLICATION-DESCRIPTION OF MOTION IN TWO AND THREE DIMENSION-MCQ(LEVEL-II)
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