6.21. Model:The car is a particle subject to Newton’s laws and kinematics. Visualize:Solve:Kinetic friction provides a horizontal acceleration which stops the car. From the figure, applying Newton’s first and second laws gives kxxFfma=−=∑GG0yFnFnFmg=− =⇒= =∑Combining these two equations with kkfnμ=yields ()( )2k0.50 9.80 m/s4.9 m/sxagKinematics can be used to determine the initial velocity.
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