Physics

Problem

A seesaw

3\,\text{m}

long is pivoted at its midpoint. A child of mass

40\,\text{kg}

sits at the left end and another of mass

30\,\text{kg}

sits at the right end. At what distance from the pivot on the right side should a third child of mass

20\,\text{kg}

sit so that the seesaw balances? a)

1.00\,\text{m}

0.50\,\text{m}

0.75\,\text{m}

1.25\,\text{m}