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(d) it moves in a circular pal.4. Consider two observers moving with respect to eachother at a speed v along a straight line. They observe ablock of mass m moving a distance l on a rough surface.The following quantities will be same as observed by thetwo observers(a) kinetic energy of the block at time t(b) work done by friction(c) total work done on the block(d) acceleration of the block.9.

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