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`        a body is projected wid velocity u and at an angle x wid d horizontal.the body makes an angle of 30 degree at t = 2 sec and den after 1 sec it reaches maximum hieght.find u and x?`
7 years ago

mohit sengar
39 Points
```										half time taken =usinx/g = 3sec
therefore   u sinx = 3g
after 2 sec  let its velocity be v , then
v sin30 = u sinx -2g
v/2 =3g-2g = g   or  v= 2g    by putting the value of  u sinx
now as horizontal velocity remain constant, therefore  u cosx = vcos30
u cosx = v√3/2
u cosx =√3 g    by putting the value of v
now dividing usinx by   u cosx   we get    tanx =√3   or x =  60 degree
then u = 3g / sinx =  20√3

```
7 years ago
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