A school yard teeter totter with a total length of 4.8 m and a mass of 36 kg is pivoted at its center. A 15 kg child sits on one end of the teeter...

A school yard teeter totter with a total length of 4.8 m and a mass of 36 kg is pivoted at its center. A 15 kg child sits on one end of the teeter totter.(a) Where should a parent push with a force of 185 N in order to hold the teeter totter level? (b) Where should the parent push with a force of 363 N to keep the teeter totter level?