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8 May, 07:02

2000-kg car decelerated from 10 m/s to 5 m/s. What is the work done on the car?

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  1. 8 May, 09:54
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    A 2000-kg car decelerated from 10 m/s to 5 m/s. What is the work done on the car?

    Known:

    Car's mass (m) = 2000 kg

    Initial speed (vo) = 10 m/s

    Final speed (vt) = 5 m/s

    Wanted: net work

    Solution:

    Net work:

    Wnet = ΔEK

    Wnet = ½ m (vt2 - vo2)

    Wnet = ½ (2000) (52 - 102)

    Wnet = (1000) (25 - 100)

    Wnet = (1000) (-75)

    Wnet = - 75,000 Joule

    The minus sign indicates that the direction of displacement is opposite with the direction of the net force.
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