Question

Compute the minimum distance that a truck slides on a horizontal

asphalt road if it is traveling at 20 m/s. The coefficient of sliding

friction between asphalt and rubber tire is 0.50. The mass of the

truck is 8000 kg.

Answer 1

The truck acceleration

$$a=\frac{F}{m}=\frac{\mu mg}{g}=\mu g\\ =0.50*9.8=4.9\:\rm m/s^2$$

The distance

$$d=\frac{v_0^2}{2a}=\frac{20^2}{2*4.9}=41\:\rm m$$