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    Muruga210's Avatar
    Muruga210 Posts: 5, Reputation: 1
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    #1

    Jan 24, 2014, 07:55 AM
    Velocity and energy
    A man 50kg runs at a speed of 9m/s, stops for 0.3s, then makes a high jump to a height of 1.5m. What is his acceleration at the start of the jump?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Jan 24, 2014, 08:47 AM
    Show us yor attempt at solving this and we'll give you some guidance if needed. But given the fact that the man stopped before jumping - what do you think that means with respect to the any effect on his acceleration when he makes the jump?
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    Muruga210 Posts: 5, Reputation: 1
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    #3

    Jan 24, 2014, 10:26 AM
    I calculated the velocity at the start of the jump by equating the P.E and K.E and got 4.95m/s. He pushes his feet for 0.3s before taking the jump. The question asks for his acceleration.
    Thanks for trying to help me!
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    ebaines Posts: 12,131, Reputation: 1307
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    #4

    Jan 24, 2014, 12:48 PM
    If you assume that his acceleration is constant during that 0.3 seconds, then you can use

    a = delta v/time
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