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10 September, 11:21

A ball rolls along a smooth horizontal floor at 10 m/s, then starts up a 20 degree ramp. How high does it go before rolling back?

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  1. 10 September, 13:20
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    If we neglect friction then only mgsin20 lower the speed of the ball

    ma=mgsin20

    a=gsin20=3.4 m/s^2

    of course we insert it next formula with a negative because the speed decreases

    v^2-v0^2=2ah

    100-0=6.8h

    h=100/6.8=14.7 m
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