Question 575892
the deceleration is ( change in speed ) / ( change in time )
{{{ ( 40 - 100 ) / ( 3/60 ) }}} ( cm/min ) / min
Note that 3 sec = 3/60 min
{{{ (-60 ) / (3/60) }}}
{{{ (-60)*( 60/3) }}}
{{{ -3600/3 = -1200 }}} (cm/min)/min
{{{ -1200 }}} (cm/min)/min x {{{ 1/100 }}} m/cm = {{{ -12 }}} m/min2
The deceleration rate is -12 meters/minute per minute