Answer:
The force exerted by the car engine was 3000 N
Explanation:
Mechanical Force
According to the second Newton's law, the net force exerted by an external agent on an object of mass m is:
[tex]F=m.a[/tex]
Where a is the acceleration of the object.
On the other hand, the equations of the Kinematics describe the motion of the object by the equation:
[tex]v_f=v_o+a.t[/tex]
Where:
vf is the final speed
vo is the initial speed
a is the acceleration
t is the time
The question describes how Meitner drove home taking her car from rest to a speed of 20 m/s in 10 seconds. This provides us the following data:
vf=20 m/s, v0=0 (rest), t = 10 seconds.
From the kinematics equation, we can solve for a:
[tex]\displaystyle a=\frac{v_f-v_o}{t}[/tex]
[tex]\displaystyle a=\frac{20\ m/s-0}{10\ s}=2\ m/s^2[/tex]
The force exerted by the car engine was:
[tex]F=1500\ kg\cdot 2\ m/s^2[/tex]
[tex]F=3000\ N[/tex]
The force exerted by the car engine was 3000 N
