Answer to Question #313698 in Physics for jane

Question #313698

An object starts from rest with a constant acceleration of 10 ft/s² along a straight road. Determine the velocity after 3.5 sec, b) the average velocity for the 3.5 seconds interval, and c) the distance travelled in this given time.


1
Expert's answer
2022-03-18T09:08:24-0400

(a)

v=v0+at=0ft/s+10ft/s2×3.5s=35ft/sv=v_0+at\\ =\rm 0\: ft/s+10\: ft/s^2\times 3.5\: s=35\: ft/s

(b)

vave=v0+v2=0ft/s+35ft/s2=17.5ft/sv_{\rm ave}=\frac{v_0+v}{2}\\ =\rm\frac{0\: ft/s+35\: ft/s}{2}=17.5\: ft/s

(c)

d=vavet=17.5ft/s×3.5s=61.25ftd=v_{\rm ave}t\\ =\rm 17.5\: ft/s\times 3.5\: s=61.25\: ft


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