Engineering Mechanics - KOP: Work and Energy - Discussion

Discussion :: KOP: Work and Energy - General Questions (Q.No.15)


A car is equipped with a bumper B designed to absorb collisions. The bumper is mounted to the car using pieces of flexible tubing T. Upon collision with a rigid barrier A, a constant horizontal force F is developed which causes a car deceleration of 3g = 29.43 m/s2 (the highest safe deceleration for a passenger without a seatbelt). If the car and passenger have a total mass of 1.5 Mg and the car is initially coasting with a speed of 1.5 m/s, compute the magnitude of F needed to stop the car and the deformation x of the bumper tubing.

[A]. F = 44.1 kN, x = 38.2 mm
[B]. F = 22.1 kN, x = 76.4 mm
[C]. F = 22.1 kN, x = 38.2 mm
[D]. F = 44.1 kN, x = 76.4 mm

Answer: Option A


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