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A man walks on a straight road from his ...

A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km.`h^(-1)` . Finding the market closed he instantly turns and walks back home with a speed of 7.5 km.`h^(-1)` . What is the
(a) magnitude of average velocity and

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A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km. h^(-1) . Finding the market closed he instantly turns and walks back home with a speed of 7.5 km. h^(-1) . What is the average speed of the man over the interval of time (i) 0 to 30 min (ii) 0 to 50 min (iii) 0 to 40 min? [Note: you will appreciate speed as total path length divided by time and not as magnitude of average velocity. You would not like to tell the tired man on his return home that his average speed was zero! ]

A car is moving along a circular path of radius 20 m with a speed of 40 km cdot h^(-1) . Find its angular velocity.

Knowledge Check

  • A boy goes to school from his home at a speed of x km/h and comes back at a speed of y km/h, then his average speed is-

    A
    A.M. of `x and y`
    B
    H. M. of `x and y`
    C
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    D
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    `sqrtx` km/hr
    C
    `(2xy)/(x+y)` km/hr
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