A force of 50 n acts on abody of mass 5 kg .calculate the acceleration produced

Ineed the answer to question 1 , i’m desperate

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?

If forces acting on an object are unbalanced. true or false