A car, initially traveling at 15 meters per second
north, accelerates to 25 meters per second north
in 4.0 seconds. The magnitude of the average
acceleration is
(1) 2.5 m/s^2 (3) 10. m/s^2
(2) 6.3 m/s^2 (4) 20. m/s^2
The magnitude of the acceleration of the car is given by: [tex]a= \frac{v_f-v_i}{t} [/tex] where [tex]v_i=15 m/s[/tex] is the initial speed of the car [tex]v_f=25 m/s[/tex] is the final speed of the car [tex]t=4.0 s[/tex] is the time it takes for the car to change its speed
Substituting these data into the formula, we find the magnitude of the average acceleration of the car: [tex]a= \frac{25 m/s-15 m/s}{4.0 s}=2.5 m/s^2 [/tex]
