A particle of mass m is driven by a machine that delivers a constant power k watts. If the particle starts from rest the force on the particle at time t is
$\sqrt {2mk} {\,t^{ - 1/2}}$
${1 \over 2}\sqrt {mk} \,{t^{ - 1/2}}$
$\sqrt {{{mk} \over 2}} \,{t^{ - 1/2}}$
$\sqrt {mk} \,{t^{ - 1/2}}$
Solution
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