We know that pressure=force/area Pressure varies inversely to area. The area under the handle is large so small pressure is applied on our hands. So to carry it easily the handle is broad and thick. Hope it will help you........
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a suitcase has broad and thick handle so,that it can be carried easily . from the fact that pressure = force/area ; if area will be more than the pressure exerted by the handle on our hand will be less .

i hope it helps.......... 
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