Question

A truck travelling at 54 km/h is slow down to 36 km/h in 10 sec. Find the retardation ?​

Answer 1

Answer:

the initial velocity u=54 km/hr=15m/s

final velocity v=36 kn/hr =10 m/s

t=10s

v=u+at

10=15+a10

10-5=10a

-5/10=a

a=-0.5 m/s2

Explanation:

Answer 2

Given:

• Initial Speed (u) = 54 km/h
• Final Speed (v) = 36 km/h
• Time (t) = 10 sec

To Find:

• Find the retardation?

Formula Used:

$\\ {\boxed{\sf\purple{a = \dfrac{ \Delta v }{ \Delta t} \: \: \: or \: \: \: a = \dfrac{v-u}{t} } }}$

Solution:

$\implies{\sf{a = \dfrac{ \Delta v }{ \Delta t} } } \\ \\ \implies{\sf{ a = \dfrac{10-15}{10} }} \\ \\ \implies{\sf{ a = \cancel{ \dfrac{-5}{10} }} } \\ \\ \implies{\sf\red{ a = -0.5}}$

$\bullet$ Negative sign shows Retardation.

Therefore,

The Retardation of truck is -0.5 m/s² .