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    Diksha Singh's Avatar
    Diksha Singh Posts: 6, Reputation: 1
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    #1

    Jun 19, 2015, 07:04 AM
    Power
    A car of mass m starts from rest and accelerates so that instantaneous power delivered to the car has a constant magnitude P. The instantaneous velocity of the car is proportional to??
    Ans t 1/2
    how to solve??
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Jun 19, 2015, 07:15 AM
    Hint: recall that power is defined as change in energy per unit time. Take a stab at this, and post back with what you come up with.
    Diksha Singh's Avatar
    Diksha Singh Posts: 6, Reputation: 1
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    #3

    Jun 19, 2015, 08:45 AM
    Quote Originally Posted by ebaines View Post
    Hint: recall that power is defined as change in energy per unit time. Take a stab at this, and post back with what you come up with.
    1/2 mv 2= Pxt.. thus v is proportional to under root of t.. Right?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #4

    Jun 19, 2015, 09:11 AM
    Yes - that's it.
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