Answer to Question #236321 in Physics for eshiii

Question #236321

3. The brakes of an automobile traveling with a velocity of 50 ft/s are suddenly applied. If the automobile comes to a stop after 5 s, what is its acceleration?


1
Expert's answer
2021-09-14T09:36:22-0400

By definition, the acceleration is given as a rate of speed change:


a=vfvita = \dfrac{v_f-v_i}{t}

where vf=0ft/sv_f = 0ft/s is the finall speed (car stops), vi=50ft/sv_i = 50ft/s is initial speed, and t=5st = 5s is the time. Thus, obtain:


a=050ft/s5s=10ft/s2a = \dfrac{0-50ft/s}{5s} = -10ft/s^2

Answer. 10ft/s2-10ft/s^2.


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