How long does it take an automobile travel-?
Rob L asked:
How long does it take an automobile travel-
ing in the left lane at 68.9 km/h to overtake
(become even with) another car that is trav-
eling in the right lane at 42.2 km/h, when the
cars’ front bumpers are initially 57 m apart?
Answer in units of s.
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How long does it take an automobile travel-
ing in the left lane at 68.9 km/h to overtake
(become even with) another car that is trav-
eling in the right lane at 42.2 km/h, when the
cars’ front bumpers are initially 57 m apart?
Answer in units of s.
February 17th, 2010 at 8:33 pm
assuming that the cars are not accelerating…
you take the relative velocity, which would be the difference in velocities.
68.9-42.2=26.7km/hr = 7.41666667 m / s
v*t=d
t=d/v = 57/7.41666 = 7.685sec Chris B