A westward-moving bicycle slows down from 10.0 m/s to 4.0
m/s in 3.0 seconds.
What is the magnitude (i. e., value) and direction of the
acceleration?

Explanation:

We have,

Initial speed of bicycle, u = -10 m/s (westward direction)

Final speed, v = -4 m/s (westward direction)

Time, t = 3 s

It is required to find the magnitude and the direction of the acceleration. It is equal to the change in velocity divided by time taken.

The acceleration of the bicycle is . It is in eastward direction.