An object, initially at rest, falls under the influence of gravity (neglect air resistance) and reaches a spee?

85 km/h is 23.6 m/s: always good to work in SI units. The acceleration will be the acceleration due to gravity - we'll use 9.8 m/s/s. V = you + at, where you is the initial velocity in the downward direction and is zero.

23.6 = 0 + 9.8t Rearranging gives t = 2.4 seconds.

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