. In January 2003, an 18-year-old student gained a bit of fame for surviving—with only minor injuries—a remarkable traffic accident. The vehicle he was driving was "clipped" by another one, left the road, and rolled several times. He was thrown upward from the vehicle (he wasn't wearing a seat belt) and ended up dangling from an overhead telephone cable and a ground wire about 8 meters above the ground. Rescuers got him down after 20 minutes. It is estimated that he reached a maximum height of about 10 meters.
(a) Estimate the driver's vertical speed when he was thrown from the vehicle.
(b) If he had not landed in the wires, how fast would he have been going when he hit the ground?
(a)
The driver’s vertical speed when he was thrown from the vehicle.
Answer to Problem 30P
The speed of the driver’s body when he was thrown from the vehicle is
Explanation of Solution
Given:
In January 2003, an 18 year old student gained a bit of fame for surviving- with only minor injuries-a remarkable traffic accident. The vehicle he was driving was “clipped” by another one, left the road, and rolled several times. He was thrown upward from the vehicle and ended up dangling from an overhead telephone cable and a ground wire about
Formula used:
Kinematic equation of motion states the following equation:
Where
Calculation:
From kinematic equation of motions, we get
We have
Substituting the values, we get
Conclusion:
Hence, the speed of the driver’s body when he was thrown from the vehicle is
(b)
If the driver had not landed in the wires, how fast would he have been going when he hit the ground?
Answer to Problem 30P
The speed of driver before hitting with the ground is
Explanation of Solution
Given:
Given that a person was thrown upward from the vehicle and ended up dangling from an overhead telephone cable and a ground wire about
Formula used:
Kinematic equation of motion states the following equation:
Where
Calculation:
From kinematic equation of motions, we get
We have
Substituting the values, we get
Thus, speed of driver before hitting with the ground is also
Conclusion:
Hence, the speed of driver before hitting with the ground is
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Chapter 3 Solutions
Inquiry into Physics, Loose-Leaf Version
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