Question #6a426

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Oct 22, 2017

Answer: #Deltat=3.9# #sec#

Explanation:

First, we can write out the given information:
#v_i=18.1# #m"/"s#
#a=-2.7# #m"/"s^2#
#v_f=7.6# #m"/"s#

Since we are looking for #Deltat#, the change in time, we can use the equation:
#v_f=v_i+aDeltat#

Solving for #Deltat#:
#aDeltat=v_f-v_i#

#Deltat=(v_f-v_i)/a#

Now we can substitute in our given values to find #Deltat#:
#Deltat=(7.6-18.1)/(-2.7)=3.89# or #3.9# #sec# to 2 significant figures.

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