Answer
The impulse is the change in momentum.
Using an equation from page 93, solve for the friction force.
Let's deal only with the magnitudes of these quantities.
$$Ft = \Delta(mv) =mv$$
$$F = \frac{(1000 kg)(20 m/s)}{10 s} = 2000 N.$$
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 6 - Think and Solve - Page 105: 30
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