Questions
A spring of spring constant 5x103 N/m is stretched initially by 5 cm from the unscratched position. Then the work required to stretch it further by another 5 cm is
detailed solution
Correct option is C
for a spring .U =12kx12where x1 =5 cmWhen the spring is further stretched by 5 cm, thenUâ²=12kx22Now W=Uâ²âU=12kx22âx12=125Ã10310Ã10â22â5Ã10â22 =18.75NmTalk to our academic expert!
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A body of mass 3 kg is under a force which causes a displacement in it, given by s =t2 / 3 (in m). Find the work done by the force in 2 second
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