Part 1 Two identicle .11 kg blocks (labeled 1 and 2) are initially at rest on a

Question

Part 1

Two identicle .11 kg blocks (labeled 1 and 2) are initially at rest on a frictionless surface and connected by an unstretched spring of stiffess 100 n/m. At time t=0s a constant force of 5 N to the right is applied to block 2. Later, the blocks are in the positions shown in the lower diagram. At that later time, what is the translational kinetic energy of the system consisting of the two blocks and spring.

A 1 J
B 4.5 J
C 9 J
D .35 J
E  2 J

Part 2

What is the total kinetic energy of the system consisting of the two blocks and the spring considered in the previous problem?

A 1.1 J
B 4.7 J
C 9.4 J
D .38 J
E 2.1 J

Two identicle .11 kg blocks (labeled 1 and 2) are initially at rest on a frictionless surface and connected by an unstretched spring of stiffess 100 n/m. At time t=0s a constant force of 5 N to the right is applied to block 2. Later, the blocks are in the positions shown in the lower diagram. At that later time, what is the translational kinetic energy of the system consisting of the two blocks and spring. 1 J 4.5 J 9 J .35 J 2 J What is the total kinetic energy of the system consisting of the two blocks and the spring considered in the previous problem? 1.1 J 4.7 J 9.4 J .38 J 2.1 J

Explanation / Answer

There's no time left to answer the question ....

but try using law of conseravtion of energy...

potential energy of spring = kx^2 / 2

equate the sum of kinetic and potential energies in the intital and final states and their difference must be equal to the work done by the external force....

Hope this helps... :)

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