what force is required to move a 25,000 kg vehicle from 0km/hr to 60km/hr in 20 seconds? (hint: convert to proper units, solve fore acceleration, then solve for force)
Let's first convert the initial and final speed of the vehicle in m/s: [tex]v_i = 0km/h = 0m/s[/tex] [tex]v_f = 60km/h \cdot \frac{1000 m/km}{3600 s/h} =16.67 m/s[/tex]
Therefore, the acceleration of the car is given by [tex]a= \frac{v_f-v_i}{t}= \frac{16.67 m/s-0 m/s}{20 s}=0.83 m/s^2 [/tex]
And so now we can calculate the force required by using Newton's second law: [tex]F=ma=(25000 kg)(0.83 m/s^2)=20750 N[/tex]
