one second after projection a stone moves at an angke of 45degree with the horizantal.two seconds after projectioin it moves horizantly . its angel of projection in degree is ???

jauneet singh Grade: 12

        



one second after projection a stone moves at an angke of 45degree with the horizantal.two seconds after projectioin it moves horizantly . its angel of projection in degree is ???

8 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert

147 Points

										Dear jauneet
let angel of projection is Θ and initial velocity is U
so verticle velocy = UsinΘ
  horixontal velocity =UcosΘ
after 1 sec verticle velocity will be
 V = UsinΘ -g
 horizontal velocity will remain same
so tan45 =1 = [UsinΘ -g]/UcosΘ   .............1
after 2 sec verticle velocity will be zero
 0 = UsinΘ -2g
  g = UsinΘ /2
put this value in equation 1
 1 = [UsinΘ -UsinΘ /2 ]/UcosΘ
 1 = tanΘ /2
  tanΘ =2
 Θ =tan^-12
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