Question

9. What is the mass of an objectnat is experiencingum.net force of 200/N akd an ageleration of 500
m/s??


10. During a test crash, an air bag inflates to stop a dummy's forward motion. The dummy's mass is 75
kg. If the net force on the dummy is 825 N toward the rear of the car, what is the dummy's
deceleration?

Answer 1

Explanation:

9.

Given parameters:

     Net force on object  = 200N

      Acceleration  = 500m/s²

Unknown:

Mass of the object = ?

Solution:

According to newton's second law of motion, force is the product of mass and acceleration;

      force  = mass x acceleration

Insert the parameters and solve;

         200  = mass x 500

             mass  = $\frac{200}{500}$   = 0.4kg

10:

Given parameters:

           Mass of dummy = 75kg

             Net force on dummy  = 825N

Unknown:

Dummy's deceleration = ?

 Solution:

Deceleration is the negative form of acceleration;

    Force  = mass x acceleration

       Acceleration  = $\frac{force }{mass}$  

       Acceleration  = $\frac{825}{75}$ = 11m/s²

The deceleration is -11m/s²