A box of mass 4 kg slides down a slope. The initial speed of the box was 4 m/s. After covering a distance of 20cm it comes to rest due to the friction between box and surface. Find work done by frictional force.
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A pacemaker is a small device that's placed (implanted) in the chest to help control the heartbeat. It's used to prevent the heart from beating too slowly. Implanting a pacemaker in the chest requires a surgical procedure.
A pacemaker is also called a cardiac pacing device.
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