Determine how many seconds after the start of movement the bus will reach a speed of 54 km / h with an acceleration of 0.2 m / s².
Initial data: V (speed that the bus must reach) = 54 km / h (15 m / s); a (bus acceleration) = 0.2 m / s2; the bus started moving from a place (V0 = 0 m / s).
The time when the bus reaches the required speed, we determine from the formula: V = V0 + a * t = 0 + a * t, whence t = V / a.
Calculation: t = 15 / 0.2 = 75 m.
Answer: The bus will need 75 seconds to accelerate to a speed of 54 km / h.
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