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    zeelady500 Posts: 3, Reputation: 1
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    #1

    Jul 16, 2012, 10:35 AM
    Physics online answers
    A train travels 180km with a uniform speed 60km/h,next 100km with a speed 50km/h and the last 80km with a speed 40km/h.calculate the average speed of the train.
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    zeelady500 Posts: 3, Reputation: 1
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    #2

    Jul 16, 2012, 10:38 AM
    A car starting from rest and moving with a uniform acceleration,attains a speed of 120km/h in 2minutes.find its acceleration and the distance covered by the car.
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    ebaines Posts: 12,131, Reputation: 1307
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    #3

    Jul 16, 2012, 11:39 AM
    Quote Originally Posted by zeelady500 View Post
    a train travels 180km with a uniform speed 60km/h,next 100km with a speed 50km/h and the last 80km with a speed 40km/h.calculate the average speed of the train.
    Average speed = total distance traveled divided by total time. You need to find the total time taken, by considering that the time for each segment is the distance traveled divided by speed for that segment. Post back with your answer and we'll check it for you.
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    ebaines Posts: 12,131, Reputation: 1307
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    #4

    Jul 16, 2012, 11:43 AM
    Quote Originally Posted by zeelady500 View Post
    a car starting from rest and moving with a uniform acceleration,attains a speed of 120km/h in 2minutes.find its acceleration and the distance covered by the car.
    1. Acceleration = change in velocity divided by time. I suggest putting your answer in units of m/s^2.
    2. Distance covered can be found from d = 1/2 a t^2

    Do the math and post back with your answer.
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