F m v f v iD t. With a speed of 120 kmh our braking distance calculator gives the value of the friction coefficient equal to 027. Stopping distance thinking distance braking distance.
Kinetic Energy 0 5 x mass x velocity 2 0 5 x 800 x 25 2.
A rubber ball of mass 025 kg rolls over the gravel with velocity 15 ms and halts after 2 s. It is impossible to calculate the precise stopping distance as this distance can vary significantly due to the condition of the train and the environmental conditions at the time. With a speed of 120 kmh our braking distance calculator gives the value of the friction coefficient equal to 027. The acceleration is negative.