Question

Brakes are applied to a car moving with a velocity of 30ms-1 . The brackets produce retardation of 6ms-1
How long the car take coming to a
stop

Answer 1

Inital velocity,u=30ms-1
Final velocity,v=0ms-1(car comes to rest after
applying brakes)
retardation=6ms-2
time taken=?

acelaration=
$a = v \frac{v - u}{?t}$
$6 = \frac{0 - 30}{t}$
$6 = \frac{ - 30}{t}$
By cross multiply we get,
$t = \frac{30}{6}$

$t = 5 seconds$
Time taken by the car to stop=5 seconds