Question #6a426

1 Answer
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.