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Posted by on Tuesday, March 15, 2011 at 11:10pm.

A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.50x^5 kg. Its speed is 27.0 m/s, and the net braking force is 4.30x10^5 N. (a)what is its speed 7.50 s later? (b)how far has it traveled in this time?

  • physics - , Wednesday, March 16, 2011 at 2:14am

    Use the braking force and F = ma to get the deceleration rate, a.

    (a) After t= 7.5 seconds, the velocity will be
    V(7.5) = Vo - a t
    = 27.0 m/s - a*7.5

    (b) Distance travelled at t = 7.5s
    = (Average velocity)* time
    = (1/2)*(Vo + V(7.5)) * 7.5s

  • physics - , Thursday, June 2, 2011 at 9:33am

    The answer is found with your teacher. Go ask your teacher

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