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`        A body is projected vertically upwards with velocity u. It crosses a pointin its journey at a height h twice just after 1 and 7 seconds. The valueof u in m/s is (g=10m/s 2 )`
2 years ago

## Answers : (1)

Lakshmipathi
44 Points
```							HAI PRAVEEN As the body is projected upwards we can write the equation as h=ut-1/2gt2gt2 -2ut +2h=0t1+t2 are roots of equationtherefore t1+t2=[2u/g] ----->u=g/2(t1+t2)therfore u=40 ms-1 or 40 m/s both are same.
```
2 years ago
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