Question

A massless spring with force constand 481N/m is fastened at its left end to a vertical wall. The acceleration of gravity is 9.8m/s2. An 8kg and 4kg block rest on a horizontal surface with the 8kg block in contact with the spring but not compressing it and the 4kg block in contact with the 8kg block. The 8kg block is then moved to the left compressing the spring a distance of 0.5mg and held in place while the 4kg block remains at rest as shown below. The elastic energy stored in the spring is 60.125. The 8kg black is then released and accelerates to the right toward the 4kg black. The coefficient of friction between each block and the surface is 0.5. The two blocks collide, stick together and move to the right. Remember that the spring is not attached to the 8kg block. Find the speed of the 8kg block just before it collides with the 4kg block.

Answer 1

In order to determine the speed of 8kg block before it hits the second block, calculate the net force on the 8kg block.

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