Hola me ayudan es para la tarea de mi hija Un cuerpo cae libremente tardando 7 s en llegar al suelo. a) ¿Desde qué altura se le dejo caer? b) ¿Con que velocidad, en km/h, llega al suelo?

1.state2.trash3.the earth

I'm having some difficulty seeing the diagram clearly.but the question says there's a net inward force on the object.so we know right away,  from newton's 2nd law of motion, thatthat baby is accelerating.  it doesn't even matter which way thenet force is pointing.  if there's any net force, then either theobject's speed or else its direction must be changing.