Abike 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.

Explanation:

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

Given information

Initial velocity=7 m/s

Final velocity= 4 m/s

Time= 2 seconds

Substituting the above figures we obtain

Since it's negative, this is deceleration of

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )