physics

a ball of mass 0.1kg is thrown vertically upwards with an initial velocity of 80m/s.calculate the potential energy (I) half way up (ii) at its maximum height.what is the kinetic energy as it leaves the ground

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  1. V^2 = Vo^2 + 2g*h = 0, h = -Vo^2/2g = -80/-19.6 = 4.08 m. =
    max. ht.

    1. PE = M*g*h/2 = 0.1*9.8*(4.08/2) = 2.0 Joules.

    2. PE = 0.1*9.8*4.08 = 4.0 Joules.

    3. KE = 0.5M*V^2 = 0.5*0.1*80^2 = 320 Joules.

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  2. at max ht v=0
    therfore u^2=2gh
    h=u^2/2g

    for halway do h\2

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  3. time

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  4. hw did u get u max height? i did not understand

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