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Homework Help: physics

Posted by kaf on Sunday, January 29, 2012 at 10:51pm.

A brick is thrown upward from the top of a building at an angle of 40° to the horizontal and with an initial speed of 16 m/s. If the brick is in flight for 3.4 s, how tall is the building?

• physics - drwls, Monday, January 30, 2012 at 7:22am

  At time t after throwing,
  
  Y (measured from the ground) = H + 16sin40*t - 4.9 t^2
  
  H is the building height.
  
  Set Y = 0 at t = 3.4s and solve for H
  
  H = 0 + 4.9*(3.6)^2 - 34.97 = 28.53 m
  

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