A bike is travelling at a velocity of 7 m/s. The cyclist brakes for 2 seconds when a dog runs out in front of her. The bike's new velocity is 4 m/s. Calculate the acceleration of the bike.

Respuesta :

Answer:

[tex]-1.5 m/s^{2}[/tex]

Explanation:

Acceleration is the rate of change in speed per unit time.

[tex]Acceleration=\frac {Final velocity-Initial velocity}{time taken}[/tex]

Given information

Initial velocity=7 m/s

Final velocity= 4 m/s

Time= 2 seconds

Substituting the above figures we obtain

[tex]Acceleration=\frac {4 m/s-7 m/s}{2 s}=-1.5 m/s^{2}[/tex]

Since it's negative, this is deceleration of [tex]1.5 m/s^{2}[/tex]