A car accelerates at 0.7 m/s^2 with a force of 70 Newtons. What is it's mass?

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 ?

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

The force it would take to accelerate an 900-kg car at the rate of 6m/s2