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Answer 1 · 2017-10-04T13:34:41

Part A #->1.5625 s#
Part B #->-4.54m/s^2#

A) #v_i=0m/s#

#a1.6m/s^2#

#v_f2.5m/s#

#t=?#

#a=(v_f-v_i)/t#

#t=(v_f-v_i)/a#

#=(2.5m/s)/(1.6m/s^2)#

#=1.5625 s#

B) Assuming she breaks as soon as she reaches 2.5m/s ,

#v_i=2.5m/s#

#v_f=0m/s#

#t=0.55s#

#a=?#

#a=(v_f-v_i)/t#

#a=(-2.5m/s)/(0.55s)#

#=-4.54m/s^2#