Determine the speed of the spike just after rebounding

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Reference no: EM131231725

15-11. During operation the jack hammer strikes the concrete surface with a force which is indicated in the graph. To achieve this the 2-kg spike S is fired into the surface at 90 m>s. Determine the speed of the spike just after rebounding.

15-14. A tankcar has a mass of 20 Mg and is freely rolling to the right with a speed of 0.75 m> s. If it strikes the barrier, determine the horizontal impulse needed to stop the car if the spring in the bumper B has a stiffness

(a) k S 8 (bumper is rigid), and

(b) k = 15 kN> m.

Reference no: EM131231725

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