Answer:
[tex]a=\frac{v_{f}-v_{o} }{t_{f}-t_{o} } =\frac{(7-22)\frac{m}{s} }{5s-0s} =-3\frac{m}{s^{2} }[/tex]
Explanation:
We know that the initial velocity is 22 m/s
The final velocity after applying the brakes is 7 m/s, and the time that takes it to break is 5 seconds
We know that the concept of acceleration is the change of velocity in time
[tex]a=\frac{v_{f}-v_{o} }{t_{f}-t_{o} } =\frac{(7-22)\frac{m}{s} }{5s-0s} =-3\frac{m}{s^{2} }[/tex]
The answer is negative since the car is slowing down