Question

what is the acceleration of a bike that's goes from 38km/hr to a stop in 4.5 s?

Answer 1

a = 38 / 4.5

a =  8.5

Answer 2

Answer:

The acceleration of a bike is 2.34 m/s².

Explanation:

Given that,

Velocity = 38 km/hr

Time = 4.5 s

We need to calculate the acceleration

Using equation of motion

$v = u+at$

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

Where, v = final velocity

u = initial velocity

t = time

Put the value in to the formula

$a=\dfrac{0-38\times\dfrac{5}{18}}{4.5}$

$a=-2.34\ m/s^2$

Negative sign shows the deceleration.

Hence, The acceleration of a bike is 2.34 m/s².