Question

Let’s calculate Ms Jackson’s acceleration as she comes to a stop. Remember that the formula for acceleration is the change in velocity divided by the time it took. Ms. Jackson was rolling at a velocity of 6 m/s and stopped rolling at a velocity of 0 m/s. This change took her 4 seconds. What was her acceleration?

Answer 1

Answer:

$-1.5 m/s^2$

Explanation:

The acceleration of an object is equal to the change in velocity of the object divided by the time taken for the object to change the velocity:

$a=\frac{v-u}{t}$

where:

u is the initial velocity

v is the final velocity

t is the time taken for the velocity to change from u to v

For Ms Jackson in this problem, we have:

u = 6 m/s (initial velocity)

v = 0 m/s (final velocity)

t = 4 s (time elapsed)

Substituting into the equation, we find the acceleration:

$a=\frac{0-6}{4}=-1.5 m/s^2$

And the negative sign indicates that the direction of the acceleration is opposite to the direction of motion.