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Math Help - Mechanics M1 Friction Again!!!! PLease

  1. #1
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    Mechanics M1 Friction Again!!!! PLease

    A ramp of length 5m is inclined 30 degrees to the horizontal. A parcel of mass 1kg, which may be modified as a particle is placed at rest on top of the ramp and allowed to slide down. The speed of the parcel at bottom is 7ms-1. Is this data consistant with the ramp being smooth and their being no air resitance. Explain why.

    Help please?? So confused
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  2. #2
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    if the incline is frictionless, then the acceleration of the mass down the incline is a = g\sin{\theta} , where {\theta} is the angle of the incline w/r to the horizontal.

    you were given a displacement (5 m), an initial velocity (0), and a final velocity (7 m/s) ... use your knowledge of kinematics to determine the actual acceleration of the mass, then compare it with the value of g\sin(30).
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