Question

As you brake your bicycle, your velocity changes from 20 east m/s to 10 east m/s in 5 seconds.
What is your acceleration?

Answer 1

Answer:

-2 would be your acceleration

Explanation:.

Answer 2

As the brake was applied to the bicycle, the speed slowed down from 20m/s to 10m/s with an acceleration of -2m/s² [ Negative acceleration due east ]

Given the data in the question;

• Initial velocity; $u = 20m/s\ \ [due\ east]$

• Final velocity; $v = 10m/s\ \ [due\ east]$

• Time taken for the velocity to drop from $u$ to $v$; $t = 5s$

• Acceleration; $a = ?$

To find the acceleration "a" of the bicycle, we make use of the First Equation of Motion:

$v = u + at$

We make "a", the subject of the formula

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

Now, we substitute in our given values

$a = \frac{10m/s\ -\ 20m/s}{5s}$

$a =\frac{-10m/s}{5s} \\\\a = -2m/s^2 \ [due\ east] the\ negative\ sign\ indicates\ retar.$

Therefore, as the brake was applied to the bicycle, the speed slowed down from 2om/s to 10m/s with an acceleration of -2m/s² [ Negative acceleration due east ]

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