How long will the truck move to a complete stop if the coefficient of friction during emergency braking is 0.5

How long will the truck move to a complete stop if the coefficient of friction during emergency braking is 0.5, and the modulus of its speed at the beginning of braking is 30 m / s

Task data: μ (coefficient of friction) = 0.5; V1 (speed modulus at the beginning of deceleration) = 30 m / s.

Reference values: g (acceleration due to gravity) ≈ 10 m / s2.

1) Determine the acceleration of a given truck during emergency braking: m * a = Ftr. = μ * m * g, whence a = μ * g = 0.5 * 10 = 5 m / s2.

2) Duration of movement to a complete stop: t = (V2 – V1) / (-a) = 30/5 = 6 s.

Answer: Emergency braking of the specified truck will last 6 seconds.