Question 597401
(a)
{{{ 30 }}} mi/hr = {{{ 30/3600 }}} mi/sec
{{{ 30/3600 = .008333 }}} mi/sec
{{{ S = .008333 - ( 6 / ( 4*3600 )) *t }}}
{{{ S = .008333 - ( 3 / ( 2*3600 )) *t }}}
{{{ S = .008333 - .0004166t }}} mi/sec
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(b)
After 10 sec:
{{{ S = .008333 - .0004166*10 }}}  mi/sec
{{{ S = .008333 - .004166 }}} mi/sec
{{{ S = .004167 }}} mi/sec
{{{ S = .004167*3600 }}} ( mi/sec )x( sec/hr )
{{{ S = 15.001 }}} mi/hr
The car will be going about 15 mi/hr