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Question 3 A spring with a stiffness 70 N/m. An object starts at the initial velocity 4m/s, and accelerate at 0.9 m/s^2. It hits the spring at 16 seconds. Calculate the potential energy of the spring Question 4 3 springs with stiffness k1 and k2. Both of them are displaced at 3m and 5m when they are hit with two different objects. The potential energy for both springs are 40 J and 70 J. Calculate the stiffness k1 and k2