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Answer :
Answer:
46s
Explanation:
displacement = (Initial Velocity)(time) + (1/2)(acceleration)(time^2)
Rob:
Initial Velocity = 0
Time = 5 mins
Acceleration = a
Displacement = (0)(5) + (1/2)(a)(5^2)
D = 12.5a
Since it’s the same road, it’s the same displacement
Jim:
Initial Velocity = 0
Time = ?
Acceleration = (3/4)a
Displacement = 12.5a
12.5a = (0)(?) + (1/2)(3/4)(a)(?^2)
12.5a = (3a/8)(?^2)
33.33 = ?^2
5.7735 = ?
Jim Time = 5.7735
Time Difference = JimTime - RobTime = 0.7735 mins
Convert to secs = 0.7735 x 60 = 46.41 secs
Answer = 46 secs
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