# How long does it take for a bus to complete a 100m path, if the length of the bus is 20m, and the speed is 72km / h?

March 26, 2021 | education

| **How long does it take for a bus to complete a 100m path, if the length of the bus is 20m, and the speed is 72km / h? Can the bus be considered as a material point.**

The bus, as a material point, cannot be considered, since its dimensions cannot be neglected for calculation (follows from the definition of a material point).

Initial data: S (path length) = 100 m; L (bus length) = 20 m; V (bus speed) = 72 km / h.

SI system: V = 72 km / h = 20 m / s.

1) Calculate the length of the entire path that the bus will cover:

S1 = S + L = 100 + 20 = 120 m.

2) Determine the travel time of the bus:

t = S1 / V = 120/20 = 6 s.

Answer: It will take the bus 6 seconds to complete the route.

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