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A ball is thrown upwards . Its height va...

A ball is thrown upwards . Its height varies with time as shown in figure. If the acceleration due to gravity is `7.5 m//s^(2)`, then the height h is

A

`30` sec

B

`34.5` sec

C

`36.2` sec

D

`35.4` sec

Text Solution

Verified by Experts

The correct Answer is:
C
For returning, the starting point
Area of `(DeltaOAB)=` Area of `(DeltaBCD)`
`1/2xx20xx25=1/2xxtxx4trArr t=5sqrt(5)cong11.2`
`:.` Required time `=25+11.2=36.2`
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ALLEN-MOTION IN A PALNE-EXERCISE-02
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