Question

A ball rolls onto the path of your car as you drive down a quiet neighborhood...

A ball rolls onto the path of your car as you drive down a quiet neighborhood street. To avoid hitting the child that runs to retrieve the ball, you apply your brakes for 1.14 s. The car slows down from

14.5î + 4.50

m/s to

8.25î + 3.50

m/s.

The mass of the car is 1.21  103 kg.

(a) During the time the brakes were applied, what was the average force exerted on your car? Express your answer in vector form.
F =

0.016i+0.0058j

  
How do you calculate the acceleration given the initial and final speeds, and the time of travel? Review rules of vector algebra.N

(b) How far did the car move while braking?
d =

22.35i+8.001j

  

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