Physics

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1. A person runs 800. m at an average speed of 6.00 m/s and then the next 800. m at an average speed of 8.00 m/s. Calculate (a) the total time of travel and (b) the average speed.

2. Sam travels by car from one city to another. He drives for 45.0 min at 95.0 km/h, 30.0 min at 100.0 km/h, and he spends 25.0 min eating lunch and buying gas. Determine (a) the total distance traveled and (b) the average speed for the entire trip.

  • Physics -

    Using
    Distance = speed * time
    (a)
    Total time of travel
    =800m/6s + 800m/8s
    = 233.3s
    (b)
    Total distance = 800+800=1600m
    Average speed = total distance/total time
    =1600m/233.3s
    = 6.86 m/s

    Try #2 which is similar to #1.

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