physics

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An airplane travels 2800 km at a speed of 700 km/h, decreases its speed to 500 km/h for the next 1500 km and travels the last 1000 km at a speed of 400 km/hr. Find the average speed of the plane for the trip.

  • physics -

    558km/h

  • physics -

    30

  • physics -

    How you get yhe answer

  • physics -

    speed=distance/time

    Add the total distances up: 2800+1500+1000=5300 km

    Solve for time for all parts (remember units)
    t=distance/speed
    Part A: 2800/700=4 hours
    Part B: 1500/500=3 hours
    Part C: 1000/400=2.5 hours

    Then add all time parts up
    4+3+2.5=9.5 hours

    Then finally solve for speed total

    speed=distance/time
    speed=5300 km/9.5 hours
    Speed=557.89 km/h

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