A body is projected at an angle 30, to the horizontal with a speed 30m/s. The angle made by the velocity vector with horizontal after 1.5 second is..?(g=10m/s)

Write eqn. in x – direcn.

x = ucos@*t => at t=1.5s

x = 30cos30 = 15root3

 

in y direcn. at t=1.5s

 

y = usin@*t – 0.5gt^2

  = 30sin30*1.5 – 0.5g*2.25

  = 22.5 (1– 0.5)

  = 22.5/2

  = 11.25 m

find the resulatant and apply the cos = base/hypostenuse.

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