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Posted by on Thursday, September 30, 2010 at 8:51pm.

HOW DO I DO THIS?

A daredevil is shot out of a cannon at 45.0° to the horizontal with an initial speed of 28.0 m/s. A net is positioned a horizontal distance of 51.0 m from the cannon. At what height above the cannon should the net be placed in order to catch the daredevil?

  • Physics - , Thursday, September 30, 2010 at 9:31pm

    Calculate the time to reach the 51m mark:
    t = 51/(28 cos(&theta))

    Calculate the elevation of the daredevil
    S = ut+(1/2)gt²
    = 28sin(θ)+(1/2)(-9.8)t²
    Solve for S.
    Double-check your results or else the poor (dare)devil will land on hard ground.

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