On an unknown planet an object with mass m falls with a speed v₁​ at t₁​ . At t₂​ the object has a kinetic energy KE 2​ . Use only energy based calculations to solve the following: m=0.40 kg v₁​ =6.0 m/s t₁​ =1.0 s t₂​ =2.8 s KE₂​ =112 J If the object falls a vertical distance 62.38 m between t₁​ and t₂​ , find the average net force that acted on it.