Question 30844

#1
A)
{{{65mi/hr = 1mi/Xhrs}}}
{{{65X=1}}} divide by 65
{{{x=1/65 or 0.01538 HOURS}}}
{{{0.01538hours * (60mins/hour) * (60secs/min) = 55.38secs per mile}}}

B)
{{{speed = distance/time}}}
{{{speed = 1mile/65sec}}} see part A.

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#2
{{{acceleration = (change in velocity)/time}}}
{{{A=V/t}}} or {{{t=V/A}}}
{{{t=3.5/0.5 = 7 seconds}}}

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#3
A)  Gravity has an acceleration of -9.8m/s
{{{A=V/t}}} or {{{V=At}}}
{{{V=-9.8(35)=-343m/s}}} we are looking for the magnitude of the velocity or V=343m/s

B)  Im not sure what you are looking for here.  What is the original height?  the launch height the height at 35 seconds? etc.