21. A 300 N force acts on a 25 kg object. The acceleration of the object is 7500m/s
300 m/s
25m/s
12m/s

Explanation:

Force is the product of mass and acceleration.

The mass is 25 kilograms and the force is 300 Newtons, but we should convert the units to make the problem easier later.

Substitute the known values in for the variables ( F and m).

Since we are solving for a, we must isolate the variable. a is being multiplied by 25 kilograms and the inverse of multiplication is division. Divide both sides by 25 kg.

The kilograms will cancel out (hence our earlier unit conversion).

The acceleration is 12 meters per square second.

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion