Question

when a car driver travelling at a speed of 100 m/s applies brakes ang bring tha car to rest in 20 second then the car relation will be .​

Answer 1

$\large \text{Correct Question}$

when a car driver travelling at a speed of 100 m/s applies brakes and bring the car to rest in 20 second then the car retardation will be .

$\large \text{Required Solution}$

Given -

• Initial velocity = 100 m/s (u)
• Final Velocity = 0 m/s (v)
• Time = 20 sec (t)

To Find -

• Negative acceleration ( Retardation)

Formula required -

$\sf \: a_{(acceleration)} = \dfrac{v_{(final velocity)} - u_{(initial velocity)}}{t_{(time)}}$

Step by step Explanation -

$\sf :\Longrightarrow \: a= \dfrac{0-100}{20}$

$\sf :\Longrightarrow \: a = \dfrac{-100}{20}$

$\sf :\Longrightarrow \: a= \bold{-5}$

Retardation = 5 m/s²