Question: A crash test with simulated occupants for a new 2000 lbf car model wants to measure the maximum speed that the shock absorber system

A crash test with simulated occupants for a new 2000 lbf car

A crash test with simulated occupants for a new 2000 lbf car model wants to measure the maximum speed that the shock absorber system protects the vehicle. It uses a lightweight barrier weighing 300 lbf followed by a spring as shown in the foil. The spring has a coefficient of 700 lbf/ft and a length of 22 ft in its neutral state, finding that the car is protected while the spring is compressed a maximum of 12 ft. The coefficient of friction in the area before the barrier is 0.8. Assume that the vehicle is stationary at the end of the test and remains attached to the barrier (box) after impact. VA = ? m/s VA A WB = 300 lbf B k = 700 lbf/ft www.

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