I need help with these 2 questions plsss

100 A bathroom scale has a spring under the plate a person stands on. When an 80 kg person stands on the scale, the spring compresses 0.20 cm. What is the spring constant and how much energy, is stored in the spring? 0120 Cm 0100 2 m Too 10./What frequency is heard by a person watching an oncoming ambulance moving at 110 km/h and emitting a steady 800-Hz sound from its siren? The speed of sound under the day's conditions is 345 m/s