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If an object is thrown upwards and rises...

If an object is thrown upwards and rises to á height of 10 m. Calculate the velocity with which the object was thrown upwards and time taken by the object to reach the highest point.

A

12m/s ,1 .43 s

B

14 m/s . 1.84 s

C

14 m/s , 1.43 s

D

12 m/s , 1.84 s

Text Solution

Verified by Experts

The correct Answer is:
C
Height raised , h = 10 m
Final velocity , v= 0m/s
Acceleration due to gravity , `g=9.8m//s^(2)`
Acceleration due to object , `a=-9.8m//s^(2)`
Now , we know that `v^(2)=u^(2)+2ah`
`0=u^(2)+2xx(-9.8)xx10`
`-u^(2)=-2xx9 .8xx10`
`u = sqrt(196)m//s`
`=14m//s`
Also , v = u+at
`0.14m//s-9.8m//s^(2)xxt`
`rArrt=1.43s`
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