H2P-21

Centripetal force

H2 Physics · JC 1 · Hard · Centripetal force

A 0.50 kg toy car enters a smooth vertical loop of radius 1.2 m. What is the minimum speed at the bottom so that it just maintains contact with the track at the top of the loop? Take

g = 9.81\,\text{m s}^{-2}

$\sqrt{2gr}$
$\sqrt{3gr}$
$\sqrt{5gr}$
$\sqrt{7gr}$

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