Question

Dean is slowing down on his skateboards. He starts at a speed of 5.5 m/s and slows to 1.0 m/s over a time of 3.0 seconds. What is Dean’s acceleration?

Answer 1

Use 1st equation of motion

v=u+at

v=1m/s
u=5.5m/s
t=3s

1=5.5 + 3a

a= -1.5m/s^2

Negative acceleration or retardation

Answer 2

Your Solution ☺

Given:

initial velocity (u) = 5.5 m/s

final velocity (v) = 1 m/s

Time (t) = 3 seconds

To Find:

Acceleration

According to the question,

By using Newtons First equation of motion we will solve this question,

v= u+at

where;

v = final velocity

u = initial velocity

a = acceleration

t = time

Substituting The values according the formula we get;

=> 1 = 5.5 + a * 3

=> 1 - 5.5 = 3a

=> - 4.5 = 3a

=> -4.5 / 3 = a

=> -1.5 = a

Therefore Deans acceleration = -1.5 m/s^2...