an object of weight 20N drops from rest to the ground 10 m below. it strikes the ground with force of about. A. 10N B.20N C.40N D.200N E. cannot be determined from this information

Could someone . i have tried to solve myself but my calculation is off

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system

Which of the following statements accurately describes the sign of the work done on the box by the force of the push? a. positive b. negative c. zero