Question 683725
If it's a direct variation, I can say
{{{ 20 / 50 }}} ( m/s ) / J is a constant
(a)
{{{ 2/5 = 4/E }}}
{{{ 2E = 20 }}}
{{{ E = 10 }}} J
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(b)
{{{ 2/5 = s / 200 }}}
{{{ 400 = 5s }}}
{{{ s = 80 }}} m/sec