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A I 930-kg railroad flatcar, which can move on the tracks with virtually no friction, is sitting motionless next to a station platform. A 108-kg football player is running along the platform parallel to the tracks at 9.74 m/s. He jumps onto the back of the flatcar. (a) What is the speed of the flatcar after he is aboard and at rest on the flatcar? (b) Now he starts to walk, at 0.520 m/s relative to the flatcar, to the front of the car. What is the speed of the flatcar as he walks?

A I 930-kg railroad flatcar, which can move on the tracks with virtually no friction, is sitting motionless next to a station platform. A 108-kg football player is running along the platform parallel to the tracks at 9.74 m/s. He jumps onto the back of the flatcar. (a) What is the speed of the flatcar after he is aboard and at rest
on the flatcar? (b) Now he starts to walk, at 0.520 m/s relative to the flatcar, to the front of the car. What is the speed of the flatcar as he walks?

Grade:11

1 Answers

Kevin Nash
askIITians Faculty 332 Points
8 years ago
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From the above observation we conclude that, the speed v2 of the flat car as he walks would be 0.488 m/s.

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