Question

7. Peter found an amazing fact in an amusement park when he tried to ride the Magic Mountain Superman. Powerful magnets accelerate a car and its riders from zero to 45 m/s in 7 seconds. Suppose the mass of the car and riders is 5,600 kg. What is the average net force exerted on the car and riders by the magnets?

Answer 1

The average net force exerted is 36000 N.

Explanation:

According to Newton's 2nd law of motion,

The net force acting upon the object is the product of mass and acceleration of an object.

                                Force = ma

where m represents the mass,

          a represents the acceleration.

                  Acceleration = (change in speed) / (change in time)

                   Acceleration = (45 m/s) / (7 sec) = (45 / 7) m/s²

                              Force = (5,600 kg) x (45 /7  m/s²)

                              Force = (800 x 45) Newtons

                              Force = 36000 Newtons.