1.) A 1,882-kg car moves in the +x direction with speed 14.5 m/s. Assuming const

Question

1.) A 1,882-kg car moves in the +x direction with speed 14.5 m/s. Assuming constant braking and drag forces, find the work needed to stop the car in a distance of 145 m.

2.)An object moves 4.37 m in the +x direction under the influence of a 483-N force directed 43 degrees above the x axis. Find the work done on the object. Give your answer in Joules.

3.)A 2.83-kg book slides 1.17 m along a level surface. The coefficient of kinetic friction between book and surface is0.41. Find the work done by friction. Give your answer in Joules

Explanation / Answer

1) v^2-u^2=2aS

0-14.5^2 =2*(a)*145

a=-0.725m/s2

W=F*S= 1882*0.725*145=197845.25J=197.84kJ

2)W=Fs cos theta

           =483*4.37*cos 43=1543.67J

3)work done by froction = Ff**d

                                    = 0.41*2.83*9.8*1.17=13.3J

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