Question

A car was moving at a rate of 18 km/h . when brakes were applied , it comes to rest in a distance of 100 m . calculate the retardation produced by the brakes .
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Answer 1

Explanation:

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Answer 2

Answer:

Retardation produced by the brakes is 0.125 m/s²

Explanation:

It is given that -

• A car was moving at a rate of 18 km/h
• When brakes are applied, it comes to rest in a distance of 100 m.

We have to find the deceleration produced by the brakes.

Solution:

Using equation of motion,

v² - u² = 2aS ..... (1)

where,

• v = 0
• u = 18 km/h
• S = 100 m

Substitute the values in eq (1),

$\longrightarrow$ a = $\dfrac{-5 \times 5}{2 \times 100}$

$\longrightarrow$ a = - $\dfrac{1}{5}$

$\longrightarrow$ a = - 0.125 m/s²

Hence, deceleration produced by the brakes is 0.125 m/s²