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A body is projected vertically upward fr...

A body is projected vertically upward from the surface of the earth, then the velocity-time graph is:-

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The correct Answer is:
`v_(A)=10 ms^(-1), v_(B)=30 ms^(-1)`
Let `v_(AB)=v-(-3v)=4v`

time `=160/(4v)=4` sec `v=10 m//s`
velocity of train `v_(A)=10 m//s`
`v_(B)=3xxv=30 m//s`
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