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A stone is thrown upwards and it rises t...

A stone is thrown upwards and it rises to a height 0f 200m. The relative velocity of the stone with respect to the earth will be maximum at :-

Text Solution

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The correct Answer is:
`vec(s)=10(t-1)hat(i)+10hat(j)(a) t=1/2 h, 10 km` (b) `(10sqrt(5))/2, t=2 hr`
It's velocity is `10 hat (i)`

`:.` displacement after time `'t' = 10 hat (i) xx t`
Velocity of second ship `= u xx ((hat (i) +2 hat(j)))/(sqrt(5))`
`tan theta = (2u//5)/((10 -(u)/(sqrt(5))))=(2 xx 10 sqrt(5))/(10 sqrt(5) -10 sqrt(5))`
(i) `t = (10)/(20) = (1)/(20) sec`, minimum distance = 10 km.
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