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SHASHWAT AGARWAL Grade: 12
        

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?

6 years ago

Answers : (1)

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


 

6 years ago
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