Question

A bus is traveling at 72km/hr . Brakes are applied the bus comes to a stop after 10 m . Find the retardation of the brakes.

Please correct answer give...

Thank you..​

Answer 1

Using equation: v^2-u^2=2as

v=0 (because the bus stops), u=72km/hr= 20m/s, s=10m. So by substituting, 0^2-20^2=20a, a=(-20m/s^2)

Answer 2

Answer:

we know that for converting km/hr into m/s we have to multipy by 5/18 therefore; 72km/hr= 20m/s

ATP,

v=u+at

0=20+a(10)

0-20=10a

a=-20/10

a= -2m/s²

Retardation = 2m/s²

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